[{"type": "rook-pawn-vs-rook", "fen": "3K4/3P1k2/8/8/8/8/4R3/2r5 w - - 0 1", "preFen": null, "startCp": 99850, "difficulty": 0.189, "timeLimitSecs": 90, "moveCap": 46, "source": "study:Rook And Pawn Endgames: The Lucena Position", "id": "rook-pawn-vs-rook-0"}, {"type": "rook-pawn-vs-rook", "fen": "K7/P4k2/8/8/8/8/1r6/4R3 w - - 0 1", "preFen": null, "startCp": 99750, "difficulty": 0.459, "timeLimitSecs": 120, "moveCap": 54, "source": "study:Rook And Pawn Endgames: The Rook Pawn", "id": "rook-pawn-vs-rook-1"}, {"type": "rook-pawn-vs-rook", "fen": "8/P6R/5k2/8/5K2/8/8/r7 w - - 0 1", "preFen": null, "startCp": 99790, "difficulty": 0.351, "timeLimitSecs": 110, "moveCap": 51, "source": "study:Rook And Pawn Endgames: RPKrk: Rook Defending Its 7th Rank Pawn from the Rank I", "id": "rook-pawn-vs-rook-2"}, {"type": "rook-pawn-vs-rook", "fen": "r7/2k5/8/8/4P3/4K3/8/3R4 w - - 0 1", "preFen": null, "startCp": 99830, "difficulty": 0.243, "timeLimitSecs": 95, "moveCap": 47, "source": "study:Rook And Pawn Endgames: PRKrk: 4th Rank Rule II", "id": "rook-pawn-vs-rook-3"}, {"type": "rook-pawn-vs-rook", "fen": "2r5/8/8/5k2/2P5/2K5/8/4R3 w - - 0 1", "preFen": null, "startCp": 99890, "difficulty": 0.081, "timeLimitSecs": 80, "moveCap": 42, "source": "study:Rook And Pawn Endgames: PRKrk: 4th Rank Rule III: Black King on the Long Side", "id": "rook-pawn-vs-rook-4"}, {"type": "rook-pawn-vs-rook", "fen": "4r3/8/8/7k/4P3/4K3/8/6R1 w - - 0 1", "preFen": null, "startCp": 99850, "difficulty": 0.189, "timeLimitSecs": 90, "moveCap": 46, "source": "study:Rook And Pawn Endgames: PRKrk: 4th Rank Rule IV: Black King on the Sort Side", "id": "rook-pawn-vs-rook-5"}, {"type": "rook-pawn-vs-rook", "fen": "1K1k4/1P6/8/8/8/8/r7/2R5 w - - 1 1", "preFen": null, "startCp": 99850, "difficulty": 0.189, "timeLimitSecs": 90, "moveCap": 46, "source": "study:Fundamental rook endgames", "id": "rook-pawn-vs-rook-6"}, {"type": "up-pawn-rook-endgame", "fen": "5k2/8/1p1r4/pP4p1/3P1pP1/3K1P2/8/R7 w - - 0 2", "preFen": "5k2/3r4/1p1P4/pP4p1/3P1pP1/3K1P2/8/R7 b - - 0 1", "startCp": 291, "difficulty": 0.887, "timeLimitSecs": 170, "moveCap": 67, "source": "mined", "id": "up-pawn-rook-endgame-7"}, {"type": "up-pawn-rook-endgame", "fen": "8/8/5p2/3pkPp1/PR4P1/1P6/2r1K3/8 w - - 3 48", "preFen": "8/8/5p2/3pkPp1/PR4P1/1Pr5/4K3/8 b - - 2 47", "startCp": 269, "difficulty": 0.135, "timeLimitSecs": 85, "moveCap": 44, "source": "mined", "id": "up-pawn-rook-endgame-8"}, {"type": "up-pawn-rook-endgame", "fen": "8/6pk/5pp1/6P1/2r2PK1/P2R2P1/8/8 w - - 0 50", "preFen": "8/5ppk/6p1/6P1/2r2PK1/P2R2P1/8/8 b - - 0 49", "startCp": 125, "difficulty": 0.761, "timeLimitSecs": 155, "moveCap": 63, "source": "mined", "id": "up-pawn-rook-endgame-9"}, {"type": "up-pawn-rook-endgame", "fen": "8/5ppk/6p1/6P1/r4P2/P2R1KP1/8/8 w - - 3 51", "preFen": "8/5ppk/6p1/6P1/4rP2/P2R1KP1/8/8 b - - 2 50", "startCp": 234, "difficulty": 0.287, "timeLimitSecs": 100, "moveCap": 49, "source": "mined", "id": "up-pawn-rook-endgame-10"}, {"type": "up-pawn-rook-endgame", "fen": "8/5ppk/6p1/6P1/5PP1/P2R1K2/r7/8 w - - 1 52", "preFen": "8/5ppk/6p1/6P1/5PP1/P2R1K2/4r3/8 b - - 0 51", "startCp": 162, "difficulty": 0.6, "timeLimitSecs": 135, "moveCap": 58, "source": "mined", "id": "up-pawn-rook-endgame-11"}, {"type": "up-pawn-rook-endgame", "fen": "7r/1p6/p3k3/P3p3/1P2PpP1/7P/3R3K/8 w - - 1 2", "preFen": "7r/1p6/p2k4/P3p3/1P2PpP1/7P/3R3K/8 b - - 0 1", "startCp": 111, "difficulty": 0.822, "timeLimitSecs": 160, "moveCap": 65, "source": "mined", "id": "up-pawn-rook-endgame-12"}, {"type": "up-pawn-rook-endgame", "fen": "6k1/1R4p1/4p3/3p1pKP/1P3P2/2P1P3/8/2r5 w - - 2 50", "preFen": "8/1R3kp1/4p3/3p1pKP/1P3P2/2P1P3/8/2r5 b - - 1 49", "startCp": 259, "difficulty": 0.178, "timeLimitSecs": 90, "moveCap": 45, "source": "mined", "id": "up-pawn-rook-endgame-13"}, {"type": "up-pawn-rook-endgame", "fen": "6k1/2R3p1/4p3/3p1pKP/1P3P2/2P1P3/8/4r3 w - - 12 55", "preFen": "6k1/2R3p1/4p3/3p1pKP/1P3P2/2P1P3/8/2r5 b - - 11 54", "startCp": 173, "difficulty": 0.552, "timeLimitSecs": 130, "moveCap": 57, "source": "mined", "id": "up-pawn-rook-endgame-14"}, {"type": "up-pawn-rook-endgame", "fen": "6k1/2R3p1/4p3/3p1p1P/1P3P1K/2P1P3/8/4r3 w - - 14 56", "preFen": "6k1/2R3p1/4p3/3p1p1P/1P3P1K/2P1P3/8/6r1 b - - 13 55", "startCp": 133, "difficulty": 0.726, "timeLimitSecs": 150, "moveCap": 62, "source": "mined", "id": "up-pawn-rook-endgame-15"}, {"type": "up-pawn-rook-endgame", "fen": "8/8/7k/5R2/1p3P1p/4P3/5KP1/2r5 w - - 1 2", "preFen": "8/8/7k/5R2/1pr2P1p/4P3/5KP1/8 b - - 0 1", "startCp": 276, "difficulty": 0.104, "timeLimitSecs": 80, "moveCap": 43, "source": "mined", "id": "up-pawn-rook-endgame-16"}, {"type": "up-pawn-rook-endgame", "fen": "8/8/1R6/7k/5P1p/4PK2/1pr3P1/8 w - - 1 2", "preFen": "8/8/1R5k/8/5P1p/4PK2/1pr3P1/8 b - - 0 1", "startCp": 251, "difficulty": 0.213, "timeLimitSecs": 95, "moveCap": 46, "source": "mined", "id": "up-pawn-rook-endgame-17"}, {"type": "up-pawn-rook-endgame", "fen": "4r1k1/pp3p2/6p1/4KP2/2P5/8/PP3R1P/8 w - - 1 45", "preFen": "5rk1/pp3p2/6p1/4KP2/2P5/8/PP3R1P/8 b - - 0 44", "startCp": 260, "difficulty": 0.174, "timeLimitSecs": 90, "moveCap": 45, "source": "mined", "id": "up-pawn-rook-endgame-18"}, {"type": "up-pawn-rook-endgame", "fen": "4r1k1/pp3p2/8/5K2/2P5/8/PP3R1P/8 w - - 1 46", "preFen": "5rk1/pp3p2/8/5K2/2P5/8/PP3R1P/8 b - - 0 45", "startCp": 225, "difficulty": 0.326, "timeLimitSecs": 105, "moveCap": 50, "source": "mined", "id": "up-pawn-rook-endgame-19"}, {"type": "up-pawn-rook-endgame", "fen": "8/1k6/p7/1p6/rP5p/5P2/3RK1PP/8 w - - 4 43", "preFen": "8/1k6/p7/1p6/1P5p/5P2/r2RK1PP/8 b - - 3 42", "startCp": 180, "difficulty": 0.522, "timeLimitSecs": 125, "moveCap": 56, "source": "mined", "id": "up-pawn-rook-endgame-20"}, {"type": "up-pawn-rook-endgame", "fen": "8/1k6/p7/1p6/rP5p/5P2/4K1PP/3R4 w - - 6 44", "preFen": "8/1k6/p7/1p6/1P5p/5P2/4K1PP/r2R4 b - - 5 43", "startCp": 368, "difficulty": 0.683, "timeLimitSecs": 145, "moveCap": 60, "source": "mined", "id": "up-pawn-rook-endgame-21"}, {"type": "up-pawn-rook-endgame", "fen": "8/8/p1k5/1p6/rP5p/5P2/1R2K1PP/8 w - - 10 46", "preFen": "8/1k6/p7/1p6/rP5p/5P2/1R2K1PP/8 b - - 9 45", "startCp": 196, "difficulty": 0.452, "timeLimitSecs": 120, "moveCap": 54, "source": "mined", "id": "up-pawn-rook-endgame-22"}, {"type": "up-pawn-rook-endgame", "fen": "8/8/p1k5/1p6/1P3P1p/r7/1R2K1PP/8 w - - 1 47", "preFen": "8/1k6/p7/1p6/1P3P1p/r7/1R2K1PP/8 b - - 0 46", "startCp": 188, "difficulty": 0.487, "timeLimitSecs": 125, "moveCap": 55, "source": "mined", "id": "up-pawn-rook-endgame-23"}, {"type": "up-pawn-rook-endgame", "fen": "8/8/8/kp3P2/7p/3R4/2r1K1PP/8 w - - 2 51", "preFen": "8/8/8/kp3P2/7p/2rR4/4K1PP/8 b - - 1 50", "startCp": 233, "difficulty": 0.291, "timeLimitSecs": 100, "moveCap": 49, "source": "mined", "id": "up-pawn-rook-endgame-24"}, {"type": "up-pawn-rook-endgame", "fen": "8/8/8/3R1P2/kp5p/5K2/2r3PP/8 w - - 2 53", "preFen": "8/8/8/k2R1P2/1p5p/5K2/2r3PP/8 b - - 1 52", "startCp": 223, "difficulty": 0.335, "timeLimitSecs": 105, "moveCap": 50, "source": "mined", "id": "up-pawn-rook-endgame-25"}, {"type": "up-pawn-rook-endgame", "fen": "8/8/5P2/3R4/kp5p/5K2/6PP/2r5 w - - 1 54", "preFen": "8/8/5P2/3R4/kp5p/5K2/2r3PP/8 b - - 0 53", "startCp": 258, "difficulty": 0.183, "timeLimitSecs": 90, "moveCap": 45, "source": "mined", "id": "up-pawn-rook-endgame-26"}, {"type": "up-pawn-rook-endgame", "fen": "8/1r2k3/3Rp1p1/1p2Pp2/p2K1P2/P1P3p1/1P5P/8 w - - 0 42", "preFen": "8/1r2k3/3Rp1p1/1p2Pp2/p2K1P1p/P1P3P1/1P5P/8 b - - 1 41", "startCp": 234, "difficulty": 0.287, "timeLimitSecs": 100, "moveCap": 49, "source": "mined", "id": "up-pawn-rook-endgame-27"}, {"type": "up-pawn-rook-endgame", "fen": "8/2r1k3/3Rp1p1/1p2Pp2/p2K1P2/P1P3P1/1P6/8 w - - 1 43", "preFen": "8/1r2k3/3Rp1p1/1p2Pp2/p2K1P2/P1P3P1/1P6/8 b - - 0 42", "startCp": 293, "difficulty": 0.03, "timeLimitSecs": 75, "moveCap": 41, "source": "mined", "id": "up-pawn-rook-endgame-28"}, {"type": "up-pawn-rook-endgame", "fen": "8/2r1k3/R3p3/1p2Ppp1/p2K1P2/P1P3P1/1P6/8 w - - 0 44", "preFen": "8/2r1k3/R3p1p1/1p2Pp2/p2K1P2/P1P3P1/1P6/8 b - - 2 43", "startCp": 181, "difficulty": 0.517, "timeLimitSecs": 125, "moveCap": 56, "source": "mined", "id": "up-pawn-rook-endgame-29"}, {"type": "up-pawn-rook-endgame", "fen": "8/4k3/R3p3/1p2Ppp1/p1r2P2/P1PK2P1/1P6/8 w - - 0 45", "preFen": "8/4k3/R3p1p1/1p2Pp2/p1r2P2/P1PK2P1/1P6/8 b - - 4 44", "startCp": 184, "difficulty": 0.757, "timeLimitSecs": 155, "moveCap": 63, "source": "mined", "id": "up-pawn-rook-endgame-30"}, {"type": "up-pawn-rook-endgame", "fen": "8/4k3/1R2p3/1p2Ppp1/p3rP2/P1PK2P1/1P6/8 w - - 0 46", "preFen": "8/4k3/1R2p1p1/1p2Pp2/p3rP2/P1PK2P1/1P6/8 b - - 6 45", "startCp": 160, "difficulty": 0.609, "timeLimitSecs": 135, "moveCap": 58, "source": "mined", "id": "up-pawn-rook-endgame-31"}, {"type": "up-pawn-rook-endgame", "fen": "4r3/7p/5kp1/5p2/3R4/2K2P1P/1PP5/8 w - - 1 2", "preFen": "4r3/6kp/6p1/5p2/3R4/2K2P1P/1PP5/8 b - - 0 1", "startCp": 291, "difficulty": 0.039, "timeLimitSecs": 75, "moveCap": 41, "source": "mined", "id": "up-pawn-rook-endgame-32"}, {"type": "up-pawn-rook-endgame", "fen": "4r3/7p/5k2/5pp1/1P1R4/2K2P1P/2P5/8 w - - 0 2", "preFen": "4r3/7p/5kp1/5p2/1P1R4/2K2P1P/2P5/8 b - - 0 1", "startCp": 289, "difficulty": 0.048, "timeLimitSecs": 75, "moveCap": 41, "source": "mined", "id": "up-pawn-rook-endgame-33"}, {"type": "up-pawn-rook-endgame", "fen": "4r3/6pp/p2R4/4P3/3Pk3/P6P/7K/8 w - - 1 2", "preFen": "4r3/6pp/p2R4/3kP3/3P4/P6P/7K/8 b - - 0 1", "startCp": 296, "difficulty": 0.017, "timeLimitSecs": 70, "moveCap": 41, "source": "mined", "id": "up-pawn-rook-endgame-34"}, {"type": "up-pawn-rook-endgame", "fen": "1k6/1pp3R1/P2p4/P7/2Pp2P1/3P2K1/8/5r2 w - - 1 2", "preFen": "1k6/1pp3R1/P2p4/P7/2Pp1rP1/3P2K1/8/8 b - - 0 1", "startCp": 211, "difficulty": 0.387, "timeLimitSecs": 115, "moveCap": 52, "source": "mined", "id": "up-pawn-rook-endgame-35"}, {"type": "up-pawn-rook-endgame", "fen": "1k6/7p/P5p1/1KR2p2/5P2/4r2P/6P1/8 w - - 1 2", "preFen": "8/1k5p/P5p1/1KR2p2/5P2/4r2P/6P1/8 b - - 0 1", "startCp": 162, "difficulty": 0.6, "timeLimitSecs": 135, "moveCap": 58, "source": "mined", "id": "up-pawn-rook-endgame-36"}, {"type": "up-exchange-pieces", "fen": "6r1/2k5/2n2R2/p2p4/2pPpPb1/1pP1P1P1/PP1B1RK1/8 w - - 0 32", "preFen": "6r1/2k5/2n2R2/p2p4/1ppPpPb1/2P1P1P1/PP1B1RK1/8 b - - 0 31", "startCp": 252, "difficulty": 0.492, "timeLimitSecs": 125, "moveCap": 55, "source": "mined", "id": "up-exchange-pieces-37"}, {"type": "up-exchange-pieces", "fen": "8/pp6/2p2R1p/4P2k/3Pp2b/1P2P1K1/P2B4/4n3 w - - 0 2", "preFen": "8/pp6/2p2R1p/4P1bk/3Pp2P/1P2P1K1/P2B4/4n3 b - - 0 1", "startCp": 343, "difficulty": 0.142, "timeLimitSecs": 85, "moveCap": 44, "source": "mined", "id": "up-exchange-pieces-38"}, {"type": "up-exchange-pieces", "fen": "4r1k1/p7/npp1b2p/2P4P/3P4/2P3P1/P2K2P1/4R2R w - - 1 2", "preFen": "4r1k1/p7/npp4p/2P4P/3P2b1/2P3P1/P2K2P1/4R2R b - - 0 1", "startCp": 154, "difficulty": 0.869, "timeLimitSecs": 165, "moveCap": 66, "source": "mined", "id": "up-exchange-pieces-39"}, {"type": "up-exchange-pieces", "fen": "8/pp3kp1/2p1n2p/8/8/2P1P2P/P5P1/4R1K1 w - - 2 42", "preFen": "6k1/pp4p1/2p1n2p/8/8/2P1P2P/P5P1/4R1K1 b - - 1 41", "startCp": 343, "difficulty": 0.142, "timeLimitSecs": 85, "moveCap": 44, "source": "mined", "id": "up-exchange-pieces-40"}, {"type": "up-exchange-pieces", "fen": "5r2/p1k4p/3p4/1pp2Pn1/4K3/P7/1P5P/4R1R1 w - - 1 2", "preFen": "5r2/p1k4p/3pn3/1pp2P2/4K3/P7/1P5P/4R1R1 b - - 0 1", "startCp": 286, "difficulty": 0.362, "timeLimitSecs": 110, "moveCap": 51, "source": "mined", "id": "up-exchange-pieces-41"}, {"type": "up-exchange-pieces", "fen": "5r2/p5Rp/2kp4/1pp2P2/3nK3/P7/1P5P/4R3 w - - 1 2", "preFen": "5r2/p1k3Rp/3p4/1pp2P2/3nK3/P7/1P5P/4R3 b - - 0 1", "startCp": 272, "difficulty": 0.415, "timeLimitSecs": 115, "moveCap": 52, "source": "mined", "id": "up-exchange-pieces-42"}, {"type": "up-exchange-pieces", "fen": "5r2/R6p/2knR3/1ppp4/5K2/P7/1P5P/8 w - - 1 2", "preFen": "5r2/R6p/2k1R3/1ppp1n2/5K2/P7/1P5P/8 b - - 0 1", "startCp": 284, "difficulty": 0.369, "timeLimitSecs": 110, "moveCap": 51, "source": "mined", "id": "up-exchange-pieces-43"}, {"type": "up-exchange-pieces", "fen": "3r1k2/p2b3p/4p1p1/1ppnP3/8/PP1R4/2B2PPP/5RK1 w - - 0 27", "preFen": "3r1k2/p2b3p/2p1p1p1/1p1nP3/8/PP1R4/2B2PPP/5RK1 b - - 1 26", "startCp": 288, "difficulty": 0.354, "timeLimitSecs": 110, "moveCap": 51, "source": "mined", "id": "up-exchange-pieces-44"}, {"type": "up-exchange-pieces", "fen": "3r4/3bk2p/2p1p1p1/pp1nP3/1P6/P2R4/2B2PPP/5RK1 w - - 0 28", "preFen": "3r4/p2bk2p/2p1p1p1/1p1nP3/1P6/P2R4/2B2PPP/5RK1 b - - 0 27", "startCp": 254, "difficulty": 0.485, "timeLimitSecs": 125, "moveCap": 55, "source": "mined", "id": "up-exchange-pieces-45"}, {"type": "up-exchange-pieces", "fen": "3r4/3bk2p/p3p1p1/1ppnP3/1P6/P2R1P2/2B3PP/5RK1 w - - 0 29", "preFen": "3r4/3bk2p/p1p1p1p1/1p1nP3/1P6/P2R1P2/2B3PP/5RK1 b - - 0 28", "startCp": 306, "difficulty": 0.285, "timeLimitSecs": 100, "moveCap": 49, "source": "mined", "id": "up-exchange-pieces-46"}, {"type": "up-exchange-pieces", "fen": "3r4/3bk2p/2p1p1p1/pp2P3/1P3n2/P3RP2/2B3PP/5RK1 w - - 0 30", "preFen": "3r4/3bk2p/p1p1p1p1/1p2P3/1P3n2/P3RP2/2B3PP/5RK1 b - - 2 29", "startCp": 264, "difficulty": 0.446, "timeLimitSecs": 120, "moveCap": 53, "source": "mined", "id": "up-exchange-pieces-47"}, {"type": "up-exchange-pieces", "fen": "3r4/3bk2p/2pRp1p1/pp2P3/1P3n2/P4P2/2B3PP/5RK1 w - - 0 32", "preFen": "3r4/3bk2p/p1pRp1p1/1p2P3/1P3n2/P4P2/2B3PP/5RK1 b - - 6 31", "startCp": 355, "difficulty": 0.096, "timeLimitSecs": 80, "moveCap": 43, "source": "mined", "id": "up-exchange-pieces-48"}, {"type": "up-exchange-pieces", "fen": "3r4/3bk2p/p1pRp1p1/1p2P3/1P6/P3nPP1/2B4P/5RK1 w - - 1 33", "preFen": "3r4/3bk2p/p1pRp1p1/1p1nP3/1P6/P4PP1/2B4P/5RK1 b - - 0 32", "startCp": 230, "difficulty": 0.577, "timeLimitSecs": 135, "moveCap": 57, "source": "mined", "id": "up-exchange-pieces-49"}, {"type": "up-exchange-pieces", "fen": "5r2/3bk2p/2pRp1p1/pp1nP3/1P3P2/P5P1/2B4P/5RK1 w - - 0 34", "preFen": "5r2/3bk2p/p1pRp1p1/1p1nP3/1P3P2/P5P1/2B4P/5RK1 b - - 0 33", "startCp": 317, "difficulty": 0.242, "timeLimitSecs": 95, "moveCap": 47, "source": "mined", "id": "up-exchange-pieces-50"}, {"type": "up-exchange-pieces", "fen": "5r2/3bk3/p1pRp1pp/1p2P3/1P3P1P/P3n1P1/2B5/5RK1 w - - 1 35", "preFen": "5r2/3bk3/p1pRp1pp/1p1nP3/1P3P1P/P5P1/2B5/5RK1 b - - 0 34", "startCp": 372, "difficulty": 0.031, "timeLimitSecs": 75, "moveCap": 41, "source": "mined", "id": "up-exchange-pieces-51"}, {"type": "up-exchange-pieces", "fen": "5rk1/p1N3pp/2p5/4P3/8/6P1/bP2P2P/2Kn2R1 w - - 0 2", "preFen": "5rk1/p1N3pp/2p5/4P3/8/4n1P1/bP2P2P/2KR2R1 b - - 0 1", "startCp": 166, "difficulty": 0.823, "timeLimitSecs": 160, "moveCap": 65, "source": "mined", "id": "up-exchange-pieces-52"}, {"type": "up-exchange-pieces", "fen": "5k2/pp4p1/2ppPn1p/8/2P1Pp2/1P3P1P/6P1/5RK1 w - - 1 2", "preFen": "6k1/pp4p1/2ppPn1p/8/2P1Pp2/1P3P1P/6P1/5RK1 b - - 0 1", "startCp": 292, "difficulty": 0.338, "timeLimitSecs": 105, "moveCap": 50, "source": "mined", "id": "up-exchange-pieces-53"}, {"type": "up-exchange-pieces", "fen": "8/pp2k1p1/2ppPn1p/8/2P1Pp2/1P3P1P/6P1/3R2K1 w - - 1 2", "preFen": "5k2/pp4p1/2ppPn1p/8/2P1Pp2/1P3P1P/6P1/3R2K1 b - - 0 1", "startCp": 210, "difficulty": 0.654, "timeLimitSecs": 140, "moveCap": 60, "source": "mined", "id": "up-exchange-pieces-54"}, {"type": "up-exchange-pieces", "fen": "8/pp4p1/2ppkn1p/8/2P1Pp2/1P3P1P/6P1/2R3K1 w - - 0 2", "preFen": "8/pp2k1p1/2ppPn1p/8/2P1Pp2/1P3P1P/6P1/2R3K1 b - - 0 1", "startCp": 208, "difficulty": 0.662, "timeLimitSecs": 145, "moveCap": 60, "source": "mined", "id": "up-exchange-pieces-55"}, {"type": "up-exchange-pieces", "fen": "8/pp4p1/2pp1n1p/4k3/2P1Pp2/1P3P1P/6P1/1R4K1 w - - 1 2", "preFen": "8/pp4p1/2ppkn1p/8/2P1Pp2/1P3P1P/6P1/1R4K1 b - - 0 1", "startCp": 198, "difficulty": 0.7, "timeLimitSecs": 145, "moveCap": 61, "source": "mined", "id": "up-exchange-pieces-56"}, {"type": "up-exchange-pieces", "fen": "8/pp4p1/4kn1p/3p4/4Pp2/1P3P1P/6P1/1R4K1 w - - 0 2", "preFen": "8/pp4p1/2p1kn1p/3P4/4Pp2/1P3P1P/6P1/1R4K1 b - - 0 1", "startCp": 257, "difficulty": 0.473, "timeLimitSecs": 120, "moveCap": 54, "source": "mined", "id": "up-exchange-pieces-57"}, {"type": "up-exchange-pieces", "fen": "8/pp4p1/4kn1p/8/4pp2/1P3P1P/6P1/4R1K1 w - - 0 2", "preFen": "8/pp4p1/4kn1p/3p4/4Pp2/1P3P1P/6P1/4R1K1 b - - 0 1", "startCp": 187, "difficulty": 0.742, "timeLimitSecs": 150, "moveCap": 62, "source": "mined", "id": "up-exchange-pieces-58"}, {"type": "up-exchange-pieces", "fen": "8/pp6/4kn1p/6p1/4Pp2/1P5P/6P1/4R1K1 w - - 0 2", "preFen": "8/pp4p1/4kn1p/8/4Pp2/1P5P/6P1/4R1K1 b - - 0 1", "startCp": 164, "difficulty": 0.831, "timeLimitSecs": 160, "moveCap": 65, "source": "mined", "id": "up-exchange-pieces-59"}, {"type": "up-exchange-pieces", "fen": "8/1p4p1/p4n1p/4k3/4Pp2/1P5P/6P1/R5K1 w - - 0 2", "preFen": "8/pp4p1/5n1p/4k3/4Pp2/1P5P/6P1/R5K1 b - - 0 1", "startCp": 158, "difficulty": 0.854, "timeLimitSecs": 165, "moveCap": 66, "source": "mined", "id": "up-exchange-pieces-60"}, {"type": "up-exchange-pieces", "fen": "8/3R1pk1/p4p2/1p2bP2/6P1/8/P1P1R1Kr/8 w - - 1 2", "preFen": "8/3R1pk1/p4p2/1p2bP1r/6P1/8/P1P1R1K1/8 b - - 0 1", "startCp": 272, "difficulty": 0.415, "timeLimitSecs": 115, "moveCap": 52, "source": "mined", "id": "up-exchange-pieces-61"}, {"type": "up-exchange-pieces", "fen": "1R6/5pk1/p4p2/1p2bPr1/6P1/5K2/P1P4R/8 w - - 1 2", "preFen": "1R6/5pk1/p4p2/1p3Pr1/6P1/2b2K2/P1P4R/8 b - - 0 1", "startCp": 225, "difficulty": 0.596, "timeLimitSecs": 135, "moveCap": 58, "source": "mined", "id": "up-exchange-pieces-62"}, {"type": "up-exchange-pieces", "fen": "7R/5pk1/p4p2/1p3Pr1/6P1/5K2/P1P4b/8 w - - 0 2", "preFen": "7R/5pk1/p4p2/1p2bPr1/6P1/5K2/P1P4R/8 b - - 0 1", "startCp": 159, "difficulty": 0.85, "timeLimitSecs": 165, "moveCap": 66, "source": "mined", "id": "up-exchange-pieces-63"}, {"type": "up-exchange-pieces", "fen": "8/4kpp1/p1p4p/3n4/8/6P1/5P1P/1R4K1 w - - 1 2", "preFen": "5k2/5pp1/p1p4p/3n4/8/6P1/5P1P/1R4K1 b - - 0 1", "startCp": 157, "difficulty": 0.858, "timeLimitSecs": 165, "moveCap": 66, "source": "mined", "id": "up-exchange-pieces-64"}, {"type": "up-exchange-pieces", "fen": "8/5pp1/p2k3p/8/2p5/2Kn2P1/5P1P/R7 w - - 1 2", "preFen": "8/5pp1/p2k3p/8/1np5/2K3P1/5P1P/R7 b - - 0 1", "startCp": 216, "difficulty": 0.631, "timeLimitSecs": 140, "moveCap": 59, "source": "mined", "id": "up-exchange-pieces-65"}, {"type": "up-exchange-pieces", "fen": "8/5pp1/pkn4p/8/R1p5/2K3P1/5P1P/8 w - - 1 2", "preFen": "8/5pp1/pk5p/8/Rnp5/2K3P1/5P1P/8 b - - 0 1", "startCp": 297, "difficulty": 0.319, "timeLimitSecs": 105, "moveCap": 50, "source": "mined", "id": "up-exchange-pieces-66"}, {"type": "queen-vs-rook", "fen": "2Q5/5pk1/6p1/p4r1p/8/6PP/5P2/6K1 w - - 1 2", "preFen": "2Q3k1/5p2/6p1/p4r1p/8/6PP/5P2/6K1 b - - 0 1", "startCp": 329, "difficulty": 0.855, "timeLimitSecs": 165, "moveCap": 66, "source": "mined", "id": "queen-vs-rook-67"}, {"type": "queen-vs-rook", "fen": "8/5p1k/6p1/p4r1p/8/2Q3PP/5P2/6K1 w - - 1 2", "preFen": "8/5pk1/6p1/p4r1p/8/2Q3PP/5P2/6K1 b - - 0 1", "startCp": 369, "difficulty": 0.655, "timeLimitSecs": 140, "moveCap": 60, "source": "mined", "id": "queen-vs-rook-68"}, {"type": "queen-vs-rook", "fen": "8/5pk1/4r1p1/Q6p/8/6PP/5P2/6K1 w - - 1 2", "preFen": "8/5pk1/5rp1/Q6p/8/6PP/5P2/6K1 b - - 0 1", "startCp": 426, "difficulty": 0.37, "timeLimitSecs": 110, "moveCap": 51, "source": "mined", "id": "queen-vs-rook-69"}, {"type": "queen-vs-rook", "fen": "8/5p1k/2r3p1/4Q2p/8/6PP/5P2/6K1 w - - 1 2", "preFen": "8/5pk1/2r3p1/4Q2p/8/6PP/5P2/6K1 b - - 0 1", "startCp": 438, "difficulty": 0.31, "timeLimitSecs": 105, "moveCap": 49, "source": "mined", "id": "queen-vs-rook-70"}, {"type": "queen-vs-rook", "fen": "8/4Qpk1/2r3p1/7p/8/6PP/5P2/6K1 w - - 1 2", "preFen": "8/4Qp1k/2r3p1/7p/8/6PP/5P2/6K1 b - - 0 1", "startCp": 426, "difficulty": 0.37, "timeLimitSecs": 110, "moveCap": 51, "source": "mined", "id": "queen-vs-rook-71"}, {"type": "queen-vs-rook", "fen": "8/4Qpk1/6p1/7p/8/2r2KPP/5P2/8 w - - 1 2", "preFen": "8/4Qpk1/6p1/7p/8/5KPP/5P2/2r5 b - - 0 1", "startCp": 397, "difficulty": 0.515, "timeLimitSecs": 125, "moveCap": 55, "source": "mined", "id": "queen-vs-rook-72"}, {"type": "queen-vs-rook", "fen": "8/pp3k2/8/3r1pQ1/3p4/7P/PP5K/8 w - - 1 2", "preFen": "6k1/pp6/8/3r1pQ1/3p4/7P/PP5K/8 b - - 0 1", "startCp": 454, "difficulty": 0.23, "timeLimitSecs": 95, "moveCap": 47, "source": "mined", "id": "queen-vs-rook-73"}, {"type": "queen-vs-rook", "fen": "8/pp3k2/8/3r1p2/5Q2/3p3P/PP5K/8 w - - 0 2", "preFen": "8/pp3k2/8/3r1p2/3p1Q2/7P/PP5K/8 b - - 0 1", "startCp": 410, "difficulty": 0.45, "timeLimitSecs": 120, "moveCap": 54, "source": "mined", "id": "queen-vs-rook-74"}, {"type": "queen-vs-rook", "fen": "8/pp2k3/8/3r1p2/8/3p3P/PP1Q3K/8 w - - 0 2", "preFen": "8/pp2k3/8/3r1p2/3p4/7P/PP1Q3K/8 b - - 0 1", "startCp": 437, "difficulty": 0.315, "timeLimitSecs": 105, "moveCap": 49, "source": "mined", "id": "queen-vs-rook-75"}, {"type": "queen-vs-rook", "fen": "8/pp2k3/3r4/5p2/8/3p2KP/PP1Q4/8 w - - 0 2", "preFen": "8/pp2k3/3r4/5p2/3p4/6KP/PP1Q4/8 b - - 0 1", "startCp": 459, "difficulty": 0.205, "timeLimitSecs": 95, "moveCap": 46, "source": "mined", "id": "queen-vs-rook-76"}, {"type": "queen-vs-rook", "fen": "8/pp1k4/3r4/5p2/5K2/3p3P/PP1Q4/8 w - - 0 2", "preFen": "8/pp1k4/3r4/5p2/3p1K2/7P/PP1Q4/8 b - - 0 1", "startCp": 490, "difficulty": 0.05, "timeLimitSecs": 75, "moveCap": 42, "source": "mined", "id": "queen-vs-rook-77"}, {"type": "queen-vs-rook", "fen": "8/7p/1p3pp1/p1krp3/P3QP2/7P/6K1/8 w - - 0 2", "preFen": "3r4/7p/1p3pp1/p1kPp3/P3QP2/7P/6K1/8 b - - 0 1", "startCp": 353, "difficulty": 0.735, "timeLimitSecs": 150, "moveCap": 62, "source": "mined", "id": "queen-vs-rook-78"}, {"type": "queen-vs-rook", "fen": "4krQ1/8/7K/8/8/8/8/8 w - - 1 55", "preFen": "4k1Q1/8/7K/8/8/8/5r2/8 b - - 0 54", "startCp": 99710, "difficulty": 0.568, "timeLimitSecs": 130, "moveCap": 57, "source": "mined", "id": "queen-vs-rook-79"}, {"type": "queen-vs-rook", "fen": "3k1r2/8/4Q2K/8/8/8/8/8 w - - 3 56", "preFen": "4kr2/8/4Q2K/8/8/8/8/8 b - - 2 55", "startCp": 99730, "difficulty": 0.514, "timeLimitSecs": 125, "moveCap": 55, "source": "mined", "id": "queen-vs-rook-80"}, {"type": "queen-vs-rook", "fen": "4kr2/8/3Q3K/8/8/8/8/8 w - - 5 57", "preFen": "3k1r2/8/3Q3K/8/8/8/8/8 b - - 4 56", "startCp": 99710, "difficulty": 0.568, "timeLimitSecs": 130, "moveCap": 57, "source": "mined", "id": "queen-vs-rook-81"}, {"type": "queen-vs-rook", "fen": "3kr3/6K1/4Q3/8/8/8/8/8 w - - 9 59", "preFen": "3k1r2/6K1/4Q3/8/8/8/8/8 b - - 8 58", "startCp": 99750, "difficulty": 0.459, "timeLimitSecs": 120, "moveCap": 54, "source": "mined", "id": "queen-vs-rook-82"}, {"type": "queen-vs-rook", "fen": "2k1r3/6K1/3Q4/8/8/8/8/8 w - - 11 60", "preFen": "3kr3/6K1/3Q4/8/8/8/8/8 b - - 10 59", "startCp": 99770, "difficulty": 0.405, "timeLimitSecs": 115, "moveCap": 52, "source": "mined", "id": "queen-vs-rook-83"}, {"type": "queen-vs-rook", "fen": "3kr3/6K1/2Q5/8/8/8/8/8 w - - 13 61", "preFen": "2k1r3/6K1/2Q5/8/8/8/8/8 b - - 12 60", "startCp": 99750, "difficulty": 0.459, "timeLimitSecs": 120, "moveCap": 54, "source": "mined", "id": "queen-vs-rook-84"}, {"type": "queen-vs-rook", "fen": "3k4/4rK2/2Q5/8/8/8/8/8 w - - 15 62", "preFen": "3kr3/5K2/2Q5/8/8/8/8/8 b - - 14 61", "startCp": 99590, "difficulty": 0.892, "timeLimitSecs": 170, "moveCap": 67, "source": "mined", "id": "queen-vs-rook-85"}, {"type": "queen-vs-rook", "fen": "8/1k3K2/8/5Q2/8/8/8/4r3 w - - 19 64", "preFen": "2k5/5K2/8/5Q2/8/8/8/4r3 b - - 18 63", "startCp": 99910, "difficulty": 0.027, "timeLimitSecs": 75, "moveCap": 41, "source": "mined", "id": "queen-vs-rook-86"}, {"type": "queen-vs-rook", "fen": "6Q1/4kr1K/1pp5/8/1pP5/8/P7/8 w - - 1 39", "preFen": "6Q1/4k2K/1pp2r2/8/1pP5/8/P7/8 b - - 0 38", "startCp": 436, "difficulty": 0.32, "timeLimitSecs": 105, "moveCap": 50, "source": "mined", "id": "queen-vs-rook-87"}, {"type": "queen-vs-rook", "fen": "5r1k/6pp/1p6/p1p2p1Q/P4P2/6PK/7P/8 w - - 1 46", "preFen": "3r3k/6pp/1p6/p1p2p1Q/P4P2/6PK/7P/8 b - - 0 45", "startCp": 458, "difficulty": 0.21, "timeLimitSecs": 95, "moveCap": 46, "source": "mined", "id": "queen-vs-rook-88"}, {"type": "queen-vs-rook", "fen": "3r4/4k2p/1p4p1/p1p2p2/P1Q2P2/6PK/7P/8 w - - 6 49", "preFen": "3r4/5k1p/1p4p1/p1p2p2/P1Q2P2/6PK/7P/8 b - - 5 48", "startCp": 487, "difficulty": 0.065, "timeLimitSecs": 75, "moveCap": 42, "source": "mined", "id": "queen-vs-rook-89"}, {"type": "queen-vs-rook", "fen": "3r4/3k3p/1p4p1/p1p2p2/P4P2/6PK/4Q2P/8 w - - 8 50", "preFen": "3r4/4k2p/1p4p1/p1p2p2/P4P2/6PK/4Q2P/8 b - - 7 49", "startCp": 400, "difficulty": 0.5, "timeLimitSecs": 125, "moveCap": 55, "source": "mined", "id": "queen-vs-rook-90"}, {"type": "queen-vs-rook", "fen": "3r4/7p/1pk3p1/p1p1Qp2/P4P2/6PK/7P/8 w - - 10 51", "preFen": "3r4/3k3p/1p4p1/p1p1Qp2/P4P2/6PK/7P/8 b - - 9 50", "startCp": 420, "difficulty": 0.4, "timeLimitSecs": 115, "moveCap": 52, "source": "mined", "id": "queen-vs-rook-91"}, {"type": "queen-vs-rook", "fen": "8/7p/1pkr1Qp1/p1p2p2/P4P2/6PK/7P/8 w - - 12 52", "preFen": "3r4/7p/1pk2Qp1/p1p2p2/P4P2/6PK/7P/8 b - - 11 51", "startCp": 429, "difficulty": 0.355, "timeLimitSecs": 110, "moveCap": 51, "source": "mined", "id": "queen-vs-rook-92"}, {"type": "queen-vs-rook", "fen": "8/3r2Qp/1pk3p1/p1p2p2/P4P2/6PK/7P/8 w - - 14 53", "preFen": "8/6Qp/1pkr2p1/p1p2p2/P4P2/6PK/7P/8 b - - 13 52", "startCp": 384, "difficulty": 0.58, "timeLimitSecs": 135, "moveCap": 57, "source": "mined", "id": "queen-vs-rook-93"}, {"type": "queen-vs-rook", "fen": "8/7p/2kr2p1/pp3p2/P1p2P2/2Q3PK/7P/8 w - - 0 56", "preFen": "8/7p/1pkr2p1/p4p2/P1p2P2/2Q3PK/7P/8 b - - 3 55", "startCp": 363, "difficulty": 0.685, "timeLimitSecs": 145, "moveCap": 61, "source": "mined", "id": "queen-vs-rook-94"}, {"type": "queen-vs-rook", "fen": "5Q2/8/r7/6kp/8/1K6/8/8 w - - 1 2", "preFen": "5Q2/8/r6k/7p/8/1K6/8/8 b - - 0 1", "startCp": 99850, "difficulty": 0.189, "timeLimitSecs": 90, "moveCap": 46, "source": "mined", "id": "queen-vs-rook-95"}, {"type": "queen-vs-rook", "fen": "8/8/r6k/5Q1p/8/1K6/8/8 w - - 1 2", "preFen": "8/7k/r7/5Q1p/8/1K6/8/8 b - - 0 1", "startCp": 99850, "difficulty": 0.189, "timeLimitSecs": 90, "moveCap": 46, "source": "mined", "id": "queen-vs-rook-96"}, {"type": "rook-pawn-vs-rook", "fen": "r7/2P5/8/1K6/8/2k5/1R6/8 w - - 1 64", "preFen": "r7/2P5/8/1K6/8/8/1R1k4/8 b - - 0 63", "startCp": 99910, "difficulty": 0.027, "timeLimitSecs": 75, "moveCap": 41, "source": "mined", "id": "rook-pawn-vs-rook-97"}, {"type": "rook-pawn-vs-rook", "fen": "2r5/8/2Pk4/1K6/8/8/7R/8 w - - 1 2", "preFen": "8/2r5/2Pk4/1K6/8/8/7R/8 b - - 0 1", "startCp": 99890, "difficulty": 0.081, "timeLimitSecs": 80, "moveCap": 42, "source": "mined", "id": "rook-pawn-vs-rook-98"}, {"type": "rook-pawn-vs-rook", "fen": "8/8/2R5/1P6/K7/8/5k2/r7 w - - 1 70", "preFen": "8/8/2R5/1P6/K7/8/5k2/1r6 b - - 0 69", "startCp": 99910, "difficulty": 0.027, "timeLimitSecs": 75, "moveCap": 41, "source": "mined", "id": "rook-pawn-vs-rook-99"}, {"type": "rook-pawn-vs-rook", "fen": "2R5/8/1P6/K2k4/8/8/8/r7 w - - 1 73", "preFen": "2R5/8/1P6/K2k4/8/8/8/1r6 b - - 0 72", "startCp": 99890, "difficulty": 0.081, "timeLimitSecs": 80, "moveCap": 42, "source": "mined", "id": "rook-pawn-vs-rook-100"}, {"type": "rook-pawn-vs-rook", "fen": "1K1k4/1PR5/8/8/8/8/8/r7 w - - 1 78", "preFen": "1K1k4/1PR5/8/8/8/8/8/1r6 b - - 0 77", "startCp": 99850, "difficulty": 0.189, "timeLimitSecs": 90, "moveCap": 46, "source": "mined", "id": "rook-pawn-vs-rook-101"}, {"type": "rook-pawn-vs-rook", "fen": "1KR5/1P1k4/8/8/8/8/8/r7 w - - 3 79", "preFen": "1KRk4/1P6/8/8/8/8/8/r7 b - - 2 78", "startCp": 99850, "difficulty": 0.189, "timeLimitSecs": 90, "moveCap": 46, "source": "mined", "id": "rook-pawn-vs-rook-102"}, {"type": "rook-pawn-vs-rook", "fen": "1K6/1P1k4/8/8/8/2R5/r7/8 w - - 5 80", "preFen": "1K6/1P1k4/8/8/8/2R5/8/r7 b - - 4 79", "startCp": 99850, "difficulty": 0.189, "timeLimitSecs": 90, "moveCap": 46, "source": "mined", "id": "rook-pawn-vs-rook-103"}, {"type": "rook-pawn-vs-rook", "fen": "1K6/1P2k3/8/8/8/3R4/8/r7 w - - 7 81", "preFen": "1K1k4/1P6/8/8/8/3R4/8/r7 b - - 6 80", "startCp": 99870, "difficulty": 0.135, "timeLimitSecs": 85, "moveCap": 44, "source": "mined", "id": "rook-pawn-vs-rook-104"}, {"type": "rook-pawn-vs-rook", "fen": "8/1PK1k3/8/8/8/3R4/8/2r5 w - - 9 82", "preFen": "8/1PK1k3/8/8/8/3R4/8/r7 b - - 8 81", "startCp": 99850, "difficulty": 0.189, "timeLimitSecs": 90, "moveCap": 46, "source": "mined", "id": "rook-pawn-vs-rook-105"}, {"type": "rook-pawn-vs-rook", "fen": "8/1P2k3/1K6/8/8/3R4/8/1r6 w - - 11 83", "preFen": "8/1P2k3/1K6/8/8/3R4/8/2r5 b - - 10 82", "startCp": 99830, "difficulty": 0.243, "timeLimitSecs": 95, "moveCap": 47, "source": "mined", "id": "rook-pawn-vs-rook-106"}, {"type": "rook-pawn-vs-rook", "fen": "8/KP2k3/8/8/8/3R4/8/r7 w - - 13 84", "preFen": "8/KP2k3/8/8/8/3R4/8/1r6 b - - 12 83", "startCp": 99850, "difficulty": 0.189, "timeLimitSecs": 90, "moveCap": 46, "source": "mined", "id": "rook-pawn-vs-rook-107"}, {"type": "rook-pawn-vs-rook", "fen": "1K6/1P2k3/8/8/8/3R4/r7/8 w - - 15 85", "preFen": "1K6/1P2k3/8/8/8/3R4/8/r7 b - - 14 84", "startCp": 99870, "difficulty": 0.135, "timeLimitSecs": 85, "moveCap": 44, "source": "mined", "id": "rook-pawn-vs-rook-108"}, {"type": "rook-pawn-vs-rook", "fen": "1K1k4/1PR5/8/8/8/8/8/1r6 w - - 19 87", "preFen": "1K6/1PRk4/8/8/8/8/8/1r6 b - - 18 86", "startCp": 99910, "difficulty": 0.027, "timeLimitSecs": 75, "moveCap": 41, "source": "mined", "id": "rook-pawn-vs-rook-109"}]