Silent but Deadly

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Home * Engine Testing * Test-Positions * Silent but Deadly

Silent but Deadly (sbd),
an EPD test by Dann Corbit that is designed to help tune chess engines, first published in CCC. In August 2008, Dann found a novelty in one of the positions [2].


This is an EPD test that is designed to help tune chess engines. All of the positions are fairly quiet, and the best move is not a capture. The evaluation for the position is intended to be below one pawn for a one minute search. There are a few positions that have a score a bit larger than one pawn (marked polar) and there are a few positions that have more than one solution (marked Multiple solutions). I would like to see suggestions for replacements for the positions with comments attached. For each of these positions, ultra strong chess players chose the marked best move, as well as many strong chess engines (including Rybka and Naum at 150 seconds). So the test suite should be fairly well debugged. However, I will be very interested in any defects that can be discovered. The main intention is that you can use it to tune your chess engines at shallow depths for positional or otherwise quiet moves. [3]


1qr3k1/p2nbppp/bp2p3/3p4/3P4/1P2PNP1/P2Q1PBP/1N2R1K1 b - - bm Qc7; id "sbd.001";
1r2r1k1/3bnppp/p2q4/2RPp3/4P3/6P1/2Q1NPBP/2R3K1 w - - bm Rc7; id "sbd.002";
2b1k2r/2p2ppp/1qp4n/7B/1p2P3/5Q2/PPPr2PP/R2N1R1K b k - bm O-O; id "sbd.003";
2b5/1p4k1/p2R2P1/4Np2/1P3Pp1/1r6/5K2/8 w - - bm Rd8; id "sbd.004";
2brr1k1/ppq2ppp/2pb1n2/8/3NP3/2P2P2/P1Q2BPP/1R1R1BK1 w - - bm g3; id "sbd.005";
2kr2nr/1pp3pp/p1pb4/4p2b/4P1P1/5N1P/PPPN1P2/R1B1R1K1 b - - bm Bf7; id "sbd.006";
2r1k2r/1p1qbppp/p3pn2/3pBb2/3P4/1QN1P3/PP2BPPP/2R2RK1 b k - bm O-O; id "sbd.007";
2r1r1k1/pbpp1npp/1p1b3q/3P4/4RN1P/1P4P1/PB1Q1PB1/2R3K1 w - - bm Rce1; id "sbd.008";
2r2k2/r4p2/2b1p1p1/1p1p2Pp/3R1P1P/P1P5/1PB5/2K1R3 w - - bm Kd2; id "sbd.009";
2r3k1/5pp1/1p2p1np/p1q5/P1P4P/1P1Q1NP1/5PK1/R7 w - - bm Rd1; id "sbd.010";
2r3qk/p5p1/1n3p1p/4PQ2/8/3B4/5P1P/3R2K1 w - - bm e6; id "sbd.011";
3b4/3k1pp1/p1pP2q1/1p2B2p/1P2P1P1/P2Q3P/4K3/8 w - - bm Qf3; id "sbd.012";
3n1r1k/2p1p1bp/Rn4p1/6N1/3P3P/2N1B3/2r2PP1/5RK1 w - - bm Na4 Nce4; id "sbd.013";
3q1rk1/3rbppp/ppbppn2/1N6/2P1P3/BP6/P1B1QPPP/R3R1K1 w - - bm Nd4; id "sbd.014";
3r1rk1/p1q4p/1pP1ppp1/2n1b1B1/2P5/6P1/P1Q2PBP/1R3RK1 w - - bm Bh6; id "sbd.015";
3r2k1/2q2p1p/5bp1/p1pP4/PpQ5/1P3NP1/5PKP/3R4 b - - bm Qd6; id "sbd.016";
3r2k1/p1q1npp1/3r1n1p/2p1p3/4P2B/P1P2Q1P/B4PP1/1R2R1K1 w - - bm Bc4; id "sbd.017";
3r4/2k5/p3N3/4p3/1p1p4/4r3/PPP3P1/1K1R4 b - - bm Kd7; id "sbd.018";
3r4/2R1np1p/1p1rpk2/p2b1p2/8/PP2P3/4BPPP/2R1NK2 w - - bm b4; id "sbd.019";
3rk2r/1b2bppp/p1qppn2/1p6/4P3/PBN2PQ1/1PP3PP/R1B1R1K1 b k - bm O-O; id "sbd.020";
3rk2r/1bq2pp1/2pb1n1p/p3pP2/P1B1P3/8/1P2QBPP/2RN1R1K b k - bm Be7 O-O; id "sbd.021";
3rkb1r/pppb1pp1/4n2p/2p5/3NN3/1P5P/PBP2PP1/3RR1K1 w - - bm Nf5; id "sbd.022";
3rr1k1/1pq2ppp/p1n5/3p4/6b1/2P2N2/PP1QBPPP/3R1RK1 w - - bm Rfe1; id "sbd.023";
4r1k1/1q1n1ppp/3pp3/rp6/p2PP3/N5P1/PPQ2P1P/3RR1K1 w - - bm Rc1; id "sbd.024";
4rb1k/1bqn1pp1/p3rn1p/1p2pN2/1PP1p1N1/P1P2Q1P/1BB2PP1/3RR1K1 w - - bm Qe2; id "sbd.025";
4rr2/2p5/1p1p1kp1/p6p/P1P4P/6P1/1P3PK1/3R1R2 w - - bm Rfe1; id "sbd.026";
5r2/pp1b1kpp/8/2pPp3/2P1p2P/4P1r1/PPRKB1P1/6R1 b - - bm Ke7; id "sbd.027";
6k1/1R5p/r2p2p1/2pN2B1/2bb4/P7/1P1K2PP/8 w - - bm Nf6+; id "sbd.028";
6k1/pp1q1pp1/2nBp1bp/P2pP3/3P4/8/1P2BPPP/2Q3K1 w - - bm Qc5; id "sbd.029";
6k1/pp2rp1p/2p2bp1/1n1n4/1PN3P1/P2rP2P/R3NPK1/2B2R2 w - - bm Rd2; id "sbd.030";
8/2p2kpp/p6r/4Pp2/1P2pPb1/2P3P1/P2B1K1P/4R3 w - - bm h4; id "sbd.031";
Q5k1/5pp1/5n1p/2b2P2/8/5N1P/5PP1/2q1B1K1 b - - bm Kh7; id "sbd.032";
r1b1k1nr/1p3ppp/p1np4/4p1q1/2P1P3/N1NB4/PP3PPP/2RQK2R w Kkq - bm O-O; id "sbd.033";
r1b1k2r/p1pp1ppp/1np1q3/4P3/1bP5/1P6/PB1NQPPP/R3KB1R b KQkq - bm O-O; id "sbd.034";
r1b1k2r/ppppqppp/8/2bP4/3p4/6P1/PPQPPPBP/R1B2RK1 b kq - bm O-O; id "sbd.035";
r1b1k2r/ppq1bppp/2n5/2N1p3/8/2P1B1P1/P3PPBP/R2Q1RK1 b kq - bm O-O; id "sbd.036";
r1b1kb1r/pp2qppp/2pp4/8/4nP2/2N2N2/PPPP2PP/R1BQK2R w KQkq - bm O-O; id "sbd.037";
r1b1qrk1/pp4b1/2pRn1pp/5p2/2n2B2/2N2NPP/PPQ1PPB1/5RK1 w - - bm Rd3; id "sbd.038";
r1b2rk1/1pqn1pp1/p2bpn1p/8/3P4/2NB1N2/PPQB1PPP/3R1RK1 w - - bm Rc1; id "sbd.039";
r1b2rk1/2qnbp1p/p1npp1p1/1p4PQ/4PP2/1NNBB3/PPP4P/R4RK1 w - - bm Qh6; id "sbd.040";
r1b2rk1/pp2ppbp/2n2np1/2q5/5B2/1BN1PN2/PP3PPP/2RQK2R w K - bm O-O; id "sbd.041";
r1b2rk1/pp4pp/1q1Nppn1/2n4B/1P3P2/2B2RP1/P6P/R2Q3K b - - bm Na6; id "sbd.042";
r1b2rk1/ppp1qppp/1b1n4/8/B2n4/3NN3/PPPP1PPP/R1BQK2R w KQ - bm O-O; id "sbd.043";
r1b2rk1/ppq1bppp/2p1pn2/8/2NP4/2N1P3/PP2BPPP/2RQK2R w K - bm O-O; id "sbd.044";
r1bq1rk1/1p1n1pp1/p4n1p/2bp4/8/2NBPN2/PPQB1PPP/R3K2R w KQ - bm O-O; id "sbd.045";
r1bq1rk1/1p2ppbp/p2p1np1/6B1/2P1P3/2N5/PP1QBPPP/R3K2R w KQ - bm O-O; id "sbd.046";
r1bq1rk1/1p3ppp/p1np4/3Np1b1/2B1P3/P7/1PP2PPP/RN1QK2R w KQ - bm O-O; id "sbd.047";
r1bq1rk1/4bppp/ppnppn2/8/2P1P3/2N5/PPN1BPPP/R1BQK2R w KQ - bm O-O; id "sbd.048";
r1bq1rk1/pp1n1pbp/2n1p1p1/2ppP3/8/2PP1NP1/PP1N1PBP/R1BQ1RK1 w - - bm d4; id "sbd.049";
r1bq1rk1/pp1pppbp/2n2np1/8/4P3/1NN5/PPP1BPPP/R1BQK2R w KQ - bm O-O; id "sbd.050";
r1bq1rk1/pp2ppbp/2n2np1/2p3B1/4P3/2P2N2/PP1NBPPP/R2QK2R w KQ - bm O-O; id "sbd.051";
r1bq1rk1/pp2ppbp/2n3p1/2p5/2BPP3/2P1B3/P3NPPP/R2QK2R w KQ - bm O-O; id "sbd.052";
r1bq1rk1/pp3ppp/2n1pn2/2p5/1bBP4/2N1PN2/PP3PPP/R1BQ1RK1 w - - bm a3; id "sbd.053";
r1bq1rk1/pp3ppp/2n2n2/3p4/8/P1NB4/1PP2PPP/R1BQK2R w KQ - bm O-O; id "sbd.054";
r1bq1rk1/ppp1npb1/3p2pp/3Pp2n/1PP1P3/2N5/P2NBPPP/R1BQR1K1 b - - bm Nf4; id "sbd.055";
r1bq1rk1/ppp2ppp/2n1pn2/3p4/1bPP4/2NBPN2/PP3PPP/R1BQK2R w KQ - bm O-O; id "sbd.056";
r1bq1rk1/pppp1pbp/2n2np1/4p3/2P5/P1N2NP1/1P1PPPBP/R1BQK2R w KQ - bm O-O; id "sbd.057";
r1bqk2r/2ppbppp/p1n2n2/1p2p3/4P3/1B3N2/PPPPQPPP/RNB2RK1 b kq - bm O-O; id "sbd.058";
r1bqk2r/5ppp/p1np4/1p1Np1b1/4P3/2P5/PPN2PPP/R2QKB1R b KQkq - bm O-O; id "sbd.059";
r1bqk2r/bp3ppp/p1n1pn2/3p4/1PP5/P1N1PN2/1B3PPP/R2QKB1R b KQkq - bm O-O; id "sbd.060";
r1bqk2r/p2pppbp/2p3pn/2p5/4P3/2P2N2/PP1P1PPP/RNBQR1K1 b kq - bm O-O; id "sbd.061";
r1bqk2r/pp2bppp/2n1p3/1B1n4/3P4/2N2N2/PP3PPP/R1BQ1RK1 b kq - bm O-O; id "sbd.062";
r1bqk2r/pp2bppp/2n1p3/3n4/3P4/2NB1N2/PP3PPP/R1BQ1RK1 b kq - bm O-O; id "sbd.063";
r1bqk2r/pp2ppbp/2np1np1/2p5/4P3/1B1P1N1P/PPP2PP1/RNBQK2R w KQkq - bm O-O; id "sbd.064";
r1bqk2r/ppn1bppp/2n5/2p1p3/8/2NP1NP1/PP1BPPBP/R2Q1RK1 b kq - bm O-O; id "sbd.065";
r1bqk2r/ppp1bppp/2n5/3p4/3P4/2PB1N2/P1P2PPP/R1BQ1RK1 b kq - bm O-O; id "sbd.066";
r1bqk2r/ppp2ppp/2nb4/3np3/8/PP2P3/1BQP1PPP/RN2KBNR b KQkq - bm O-O; id "sbd.067";
r1bqk2r/ppp2ppp/3b4/4p3/8/1PPP1N2/2PB1PPP/R2Q1RK1 b kq - bm O-O; id "sbd.068";
r1bqk2r/pppp1ppp/5n2/4p3/Bb2P3/5Q2/PPPPNPPP/R1B1K2R b KQkq - bm O-O; id "sbd.069";
r1bqkb1r/pp3ppp/2n5/2pp4/3Pn3/2N2N2/PPP1BPPP/R1BQK2R w KQkq - bm O-O; id "sbd.070";
r1bqkb1r/pp3ppp/2npp3/3nP3/2BP4/5N2/PP3PPP/RNBQK2R w KQkq - bm O-O; id "sbd.071";
r1bqkbnr/3p1ppp/p1p1p3/8/4P3/3B4/PPP2PPP/RNBQK2R w KQkq - bm O-O; id "sbd.072";
r1bqkbnr/ppp2ppp/2n5/8/2BpP3/5N2/PP3PPP/RNBQK2R w KQkq - bm O-O; id "sbd.073";
r1bqrbk1/1pp3pp/2n2p2/p2np3/8/PP1PPN2/1BQNBPPP/R3K2R w KQ - bm O-O; id "sbd.074";
r1br2k1/1p2qppp/pN2pn2/P7/2pn4/4N1P1/1P2PPBP/R3QRK1 b - - bm Rb8; id "sbd.075";
r1q1k2r/1b1nbppp/pp1ppn2/8/2PQP3/1PN2NP1/PB3PBP/R2R2K1 b kq - bm O-O; id "sbd.076";
r1q1k2r/pb1nbppp/1p2pn2/8/P1PNP3/2B3P1/2QN1PBP/R4RK1 b kq - bm O-O; id "sbd.077";
r1r3k1/1bq2pbp/pp1pp1p1/2n5/P3PP2/R2B4/1PPBQ1PP/3N1R1K w - - bm Bc3; id "sbd.078";
r1rn2k1/pp1qppbp/6p1/3pP3/3P4/1P3N1P/PB1Q1PP1/R3R1K1 w - - bm Rac1; id "sbd.079";
r2q1rk1/1b1nbpp1/pp2pn1p/8/2BN3B/2N1P3/PP2QPPP/2R2RK1 w - - bm Rfd1; id "sbd.080";
r2q1rk1/1b3ppp/4pn2/1pP5/1b6/2NBPN2/1PQ2PPP/R3K2R w KQ - bm O-O; id "sbd.081";
r2q1rk1/pb1nppbp/6p1/1p6/3PP3/3QBN1P/P3BPP1/R3K2R w KQ - bm O-O; id "sbd.082";
r2q1rk1/pb2bppp/npp1pn2/3pN3/2PP4/1PB3P1/P2NPPBP/R2Q1RK1 w - - bm e4; id "sbd.083";
r2q1rk1/pppb1pbp/2np1np1/4p3/2P5/P1NPPNP1/1P3PBP/R1BQK2R w KQ - bm O-O; id "sbd.084";
r2qk2r/1b1n1ppp/4pn2/p7/1pPP4/3BPN2/1B3PPP/R2QK2R w KQkq - bm O-O; id "sbd.085";
r2qk2r/1b2bppp/p1n1pn2/1p6/1P6/P2BPN2/1B2QPPP/RN3RK1 b kq - bm O-O; id "sbd.086";
r2qk2r/2p2ppp/p1n1b3/1pbpP3/4n3/1BP2N2/PP1N1PPP/R1BQ1RK1 b kq - bm O-O; id "sbd.087";
r2qk2r/3n1ppp/p3p3/3nP3/3R4/5N2/1P1N1PPP/3QR1K1 b kq - bm O-O; id "sbd.088";
r2qk2r/p1pn1ppp/b3pn2/3p4/Nb1P4/1P3NP1/P3PPBP/1RBQ1RK1 b kq - bm O-O Qe7; id "sbd.089";
r2qk2r/ppp1bppp/2n2n2/8/2BP2b1/2N2N2/PP3PPP/R1BQR1K1 b kq - bm O-O; id "sbd.090";
r2qkb1r/pb1n1p2/2p1p2p/4P1pn/PppP4/2N2NB1/1P2BPPP/R2Q1RK1 w kq - bm Ne4; id "sbd.091";
r2qkb1r/pp2nppp/1np1p3/4Pb2/3P4/PB3N2/1P3PPP/RNBQ1RK1 b kq - bm Ned5; id "sbd.092";
r2qkb1r/pp3ppp/2bppn2/8/2PQP3/2N2N2/PP3PPP/R1B1K2R w KQkq - bm O-O; id "sbd.093";
r2qr1k1/p3bppp/1p2n3/3Q1N2/5P2/4B1P1/PP3R1P/R5K1 w - - bm Rd1; id "sbd.094";
r2r2k1/p1pnqpp1/1p2p2p/3b4/3P4/3BPN2/PP3PPP/2RQR1K1 b - - bm c5; id "sbd.095";
r2r2k1/pp1b1ppp/8/3p2P1/3N4/P3P3/1P3P1P/3RK2R b K - bm Rac8; id "sbd.096";
r3k2r/1b1nb1p1/p1q1pn1p/1pp3N1/4PP2/2N5/PPB3PP/R1BQ1RK1 w kq - bm Nf3; id "sbd.097";
r3k2r/1pqnnppp/p5b1/1PPp1p2/3P4/2N5/P2NB1PP/2RQ1RK1 b kq - bm O-O; id "sbd.098";
r3k2r/p1q1nppp/1pn5/2P1p3/4P1Q1/P1P2P2/4N1PP/R1B2K1R b kq - bm O-O; id "sbd.099";
r3k2r/pp2pp1p/6p1/2nP4/1R2PB2/4PK2/P5PP/5bNR w kq - bm Ne2; id "sbd.100";
r3k2r/ppp1bppp/2n5/3n4/3PB3/8/PP3PPP/RNB1R1K1 b kq - bm O-O-O; id "sbd.101";
r3kb1r/pp3ppp/4bn2/3p4/P7/4N1P1/1P2PPBP/R1B1K2R w KQkq - bm O-O; id "sbd.102";
r3kbnr/1pp3pp/p1p2p2/8/3qP3/5Q1P/PP3PP1/RNB2RK1 w kq - bm Rd1; id "sbd.103";
r3kr2/pppb1p2/2n3p1/3Bp2p/4P2N/2P5/PP3PPP/2KR3R b q - bm O-O-O; id "sbd.104";
r3nrk1/pp2qpb1/3p1npp/2pPp3/2P1P2N/2N3Pb/PP1BBP1P/R2Q1RK1 w - - bm Re1; id "sbd.105";
r3r1k1/1pqn1pbp/p2p2p1/2nP2B1/P1P1P3/2NB3P/5PP1/R2QR1K1 w - - bm Rc1; id "sbd.106";
r3r1k1/pp1q1ppp/2p5/P2n1p2/1b1P4/1B2PP2/1PQ3PP/R1B2RK1 w - - bm e4; id "sbd.107";
r3r1k1/pp3ppp/2ppqn2/5R2/2P5/2PQP1P1/P2P2BP/5RK1 w - - bm Qd4; id "sbd.108";
r3rbk1/p2b1p2/5p1p/1q1p4/N7/6P1/PP1BPPBP/3Q1RK1 w - - bm Nc3; id "sbd.109";
r4r1k/pp1bq1b1/n2p2p1/2pPp1Np/2P4P/P1N1BP2/1P1Q2P1/2KR3R w - - bm Ne6; id "sbd.110";
r4rk1/1bqp1ppp/pp2pn2/4b3/P1P1P3/2N2BP1/1PQB1P1P/2R2RK1 w - - bm b3; id "sbd.111";
r4rk1/1q2bppp/p1bppn2/8/3BPP2/3B2Q1/1PP1N1PP/4RR1K w - - bm e5; id "sbd.112";
r4rk1/pp2qpp1/2pRb2p/4P3/2p5/2Q1PN2/PP3PPP/4K2R w K - bm O-O; id "sbd.113";
r7/3rq1kp/2p1bpp1/p1Pnp3/2B4P/PP4P1/1B1RQP2/2R3K1 b - - bm Rad8; id "sbd.114";
r7/pp1bpp2/1n1p2pk/1B3P2/4P1P1/2N5/PPP5/1K5R b - - bm Kg5; id "sbd.115";
rn1q1rk1/p4pbp/bp1p1np1/2pP4/8/P1N2NP1/1PQ1PPBP/R1B1K2R w KQ - bm O-O; id "sbd.116";
rn1q1rk1/pb3p2/1p5p/3n2P1/3p4/P4P2/1P1Q1BP1/R3KBNR b KQ - bm Re8+; id "sbd.117";
rn1q1rk1/pp2bppp/1n2p1b1/8/2pPP3/1BN1BP2/PP2N1PP/R2Q1RK1 w - - bm Bc2; id "sbd.118";
rn1q1rk1/pp3ppp/4bn2/2bp4/5B2/2NBP1N1/PP3PPP/R2QK2R w KQ - bm O-O; id "sbd.119";
rn1qkbnr/pp1b1ppp/8/1Bpp4/3P4/8/PPPNQPPP/R1B1K1NR b KQkq - bm Qe7; id "sbd.120";
rn1qr1k1/pb3p2/1p5p/3n2P1/3p4/P4P2/1P1QNBP1/R3KB1R b KQ - bm d3; id "sbd.121";
rn2kb1r/pp2nppp/1q2p3/3pP3/3P4/5N2/PP2NPPP/R1BQK2R w KQkq - bm O-O; id "sbd.122";
rn3rk1/1bqp1ppp/p3pn2/8/Nb1NP3/4B3/PP2BPPP/R2Q1RK1 w - - bm Rc1; id "sbd.123";
rn3rk1/pbp1qppp/1p1ppn2/8/2PP4/P1Q2NP1/1P2PPBP/R1B1K2R w KQ - bm O-O; id "sbd.124";
rnb1k2r/1pq2ppp/p2ppn2/2b5/3NPP2/2P2B2/PP4PP/RNBQ1R1K b kq - bm O-O; id "sbd.125";
rnb2rk1/ppq1ppbp/6p1/2p5/3PP3/2P2N2/P3BPPP/1RBQK2R w K - bm O-O; id "sbd.126";
rnbq1rk1/5ppp/p3pn2/1p6/2BP4/P1P2N2/5PPP/R1BQ1RK1 w - - bm Bd3; id "sbd.127";
rnbq1rk1/pp2ppbp/2pp1np1/8/P2PP3/2N2N2/1PP1BPPP/R1BQK2R w KQ - bm O-O; id "sbd.128";
rnbq1rk1/ppp1ppbp/6p1/8/8/2P2NP1/P2PPPBP/R1BQK2R w KQ - bm O-O; id "sbd.129";
rnbqk1nr/pp3pbp/2ppp1p1/8/2BPP3/2N2Q2/PPP2PPP/R1B1K1NR w KQkq - bm Nge2; id "sbd.130";
rnbqk2r/ppp2ppp/1b1p1n2/4p3/2B1P3/2PP1N2/PP1N1PPP/R1BQK2R b KQkq - bm O-O; id "sbd.131";
rnbqk2r/pppp2pp/4pn2/5p2/1b1P4/2P2NP1/PP2PPBP/RNBQK2R b KQkq - bm Be7; id "sbd.132";
rnbqr1k1/pp1p1ppp/5n2/3Pb3/1P6/P1N3P1/4NPBP/R1BQK2R w KQ - bm O-O; id "sbd.133";
rnq1nrk1/pp3pbp/6p1/3p4/3P4/5N2/PP2BPPP/R1BQK2R w KQ - bm O-O; id "sbd.134";

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