Verified mates that are hard to find

[Dann Corbit]

Some from yacpdb, some from chestdb, others from other sources.

All of them are mates, but a bit harder to solve than others, for some engines.

rnbqkbnr/pppppppp/6B1/1Q6/B5BB/2N5/8/R2QKBNR w KQkq -
2bB4/b2p2p1/2rpp3/2N1kpKp/2P1N2R/3RpP2/3Pn1n1/8 w - -
2K3B1/8/1p6/8/7p/8/4N2p/4n2k w - -
2N1BK1n/p1p1R3/6p1/pRpk4/6p1/1P2P3/5P2/2r4b w - -
3K4/1p1B4/bB1k4/rpR1p3/2ppppp1/8/RPPPPP2/r1n5 w - -
3Nk3/3p4/3p1Q1p/5K1p/4N3/b1p1Rp2/2q1p3/r6B w - -
4b1n1/5p2/5P2/R7/p7/K7/R2PPPP1/2k5 w - -
4B3/p6p/P2p3P/3P1kp1/2P3NP/R3K2p/1r3B1N/8 w - -
6R1/8/8/7k/8/8/2p1p2p/2KbR3 w - -
7k/8/2b1B2P/7P/7P/n7/8/R3K2R w - -
7k/r4ppn/1b4p1/2pN1bB1/3qPR1R/8/2Q2PPK/8 w - -
8/4p3/3pP3/3P4/3P4/2KQ4/pppp4/rrkbb3 w - -
8/8/6BR/Pr5p/2N4p/4p3/2npN3/n2k1K2 w - -
8/8/7Q/5P2/1pP5/pP1B4/P2nppp1/K1k1bqrb w - -
8/8/p7/8/8/2p1Nppp/K2pppbr/2krbqnn w - -
8/p1p1p3/P1P1pp1K/RR2bk2/4p1p1/4PpPb/5P2/8 w - -
N2b4/3B4/3p4/3k4/P2P4/P1pPP3/P1p5/RbK5 w - -
N6R/rp5q/kp6/1p1p4/1p1p4/1N1P4/1KPP3P/8 w - -
n7/2p5/1pp5/b1p5/pkp5/N1p5/P1K5/2B5 w - -
8/2p5/2p1N3/1np5/Qbk1P3/1p6/bPp2P2/2N3K1 w - -
8/5p2/4pP2/3pP1p1/N2P1kP1/2P2p1P/2K2P2/8 w - -
b7/6p1/2p5/2p3p1/p1p1p1p1/K1P1P1Pk/1BR4P/7B w - -
KBb5/PpPp4/pP1PN3/R1p4p/1k1P3P/R7/8/8 w - -
1R3rrn/4Pp1k/5Pp1/6P1/p2p4/p2p4/P2P1P2/RN2K3 w - -
5b2/1p2p1p1/1P2p1p1/4P1Pp/8/3PB2K/7N/7k w - -
6B1/p7/4p1p1/B3PkPp/4pPpK/4P1P1/8/8 w - -
8/1pR4R/1p3p2/1P2pKB1/4P3/5pp1/5ppb/6kq w - -
8/3N4/3p4/p7/Pp1kP1p1/pK6/P1PN4/7B w - -
8/4N3/8/3p4/3p1p2/3P1N2/2B1k1K1/8 w - -
8/6p1/6p1/6p1/2K3p1/6pk/5prp/5Bbb w - -
k4B1R/1p1pKp2/qp1PbP2/bp1p1p2/1p1P1P2/1P6/8/8 w - -
k7/p6p/P3N2K/4B3/8/7N/2P3PP/8 w - -
8/2p1N3/2p5/2p5/P1kb2R1/4p3/P3p1P1/1B2B2K w - -
8/2p5/2p5/2p5/2p3p1/6P1/1pP5/kb2Q2K w - -
8/3B2pr/2rpR2p/1p1k4/3p4/pNP3B1/KnPNP2p/7b w - -
8/8/2ppp3/2pkp3/2ppp3/8/4KP2/1NB2B2 w - -
8/8/5p2/p2p4/Pk1P1P2/1P1p4/KB1p4/3B4 w - -
k1N4n/P7/P7/P7/P7/P7/1PK5/8 w - -
4k1r1/2pnp3/2B1N3/8/8/5R2/6P1/5K2 w - -
4N1K1/8/6k1/4p1P1/4P2P/3p3P/3P4/8 w - -
8/2p4p/2P4P/3p2p1/B2Pp1P1/4P1Pk/3Pp1pN/3bB1K1 w - -
2b1n3/1qp3p1/2p1p1p1/2P3p1/pP2P1N1/P3N1P1/4PPB1/4K1k1 w - -
8/2p2p2/2p2p1N/KpN1k3/6P1/P5P1/P7/8 w - -
8/3k4/8/5K2/6P1/8/8/8 w - -
8/8/8/2P5/4BB2/3P2PP/3p1kp1/3Kbrrb w - -
2K3B1/8/8/8/7p/8/4N2p/4n2k w - -
3b2N1/4p3/1p1pPp2/1P1k1Kp1/1Pp3Pp/2Pp3P/3P3P/8 w - -
3K1R2/8/8/4B2p/8/6pp/6kp/7b w - -
5k2/4p2p/6P1/3K4/8/4B3/8/8 w - -
8/2p3B1/2P3p1/2P3pb/6p1/N3K1P1/prP5/k7 w - -
8/2p5/4p3/2P1p3/4P3/3p1K2/pppp1B2/rbbk2N1 w - -
n2Bqk2/5p1p/Q4KP1/p7/8/8/8/8 w - -
1BB5/2p2p2/2P5/5P2/1P3p1p/5pbP/2P2prp/3K2kb w - -
8/1p1p1p2/1p1P1P1P/1P6/6p1/4p1p1/3pP1PB/3B1K1k w - -
4B2k/1p5p/bp5P/1p4p1/qp4P1/pp6/1r4P1/B1K5 w - -
8/5K2/3p3p/3p3P/pp1P4/rkb1R3/p1p3P1/n1B2B2 w - -
8/8/8/2p5/1pp5/brpp4/qpprpK1P/1nkbn3 w - -
kBb5/PpPp1p1p/1p1P1P1P/1P3PpK/8/8/8/6R1 w - g6
1kn5/p2p4/P1pP1p1q/1PP2P1P/5p2/4rQp1/K7/5B2 w - -
nk6/2p2pP1/KpP2P2/1Pp2P2/2P2P2/5P2/8/4B1q1 w - -
1n1k4/3pN1N1/p1pP4/P1P1p3/KBP1p3/P1P1P3/8/8 w - -
2r5/PK1k4/8/7p/7P/6P1/8/8 b - -
8/p7/8/8/8/3p1b2/pp1K1N2/qk6 w - -
k7/1pP2r2/1P6/8/8/K5PR/1PPPPP2/8 b - -
8/5ppp/8/5PPP/8/k7/8/K7 w - -
8/4p3/3pPp2/pK1P1P2/1P2NP2/4p1p1/2B1pprb/4kbrn w - -
8/6p1/p7/rp1K2p1/kb3pP1/2p2p1b/P1Np1P2/3N2R1 w - -
8/8/7p/8/6pp/4N1Pk/5K2/8 w - -
8/7p/6pP/5pP1/3BpP2/p1KpP3/pn1N4/k7 w - -
1B3N2/5p1B/2K2pn1/5krb/4p1p1/4P1P1/2P1PP2/8 w - -
8/pp4p1/4k1P1/3p4/3P4/2P5/4K2P/8 w - -
b3k3/3pPpK1/3P1P2/8/8/8/6B1/8 w - -
r4BK1/6P1/1p1p3P/3P4/2k5/p2N1q2/P7/8 w - -
1k3b1q/pP2p1p1/P1K1P1Pp/7P/2B5/8/8/8 w - -
4k3/8/8/1p5p/1P5P/8/5K2/8 w - -
8/8/8/2p4k/p1Pp3P/P5K1/8/8 b - -
8/8/4k1K1/6R1/5P2/7r/8/8 w - -
6k1/8/5pPp/5P2/7K/8/8/8 w - -
k7/8/Kp1N2q1/8/8/R7/7P/8 b - -
6k1/8/r2BK2P/6N1/8/8/8/8 w - -
8/8/8/4k3/r7/3BNP2/5K2/8 w - -
k1b5/1p1p1p1p/1PpPpP2/2B5/8/2p1p2P/2PbP3/3K4 w - -
k1b5/1p1p4/pP1Pp3/K2pPp2/1P1p1P2/3P1P2/5P2/8 w - -

[jorose]

Hi this is perfect for me! Tested the first one and my engine took 22 seconds to find Bxf7+ which SF then confirmed to be mate (and impressively suggested it at depth 0) so it seems to be the perfect difficulty for him. That being said, at much higher depth SF realised Qd1d5 mates even faster...

Do you happen to have solutions to the problems as well?

[Dann Corbit]

I do have the solutions, but just for fun this time, I will only give hints.

1B3N2/5p1B/2K2pn1/5krb/4p1p1/4P1P1/2P1PP2/8 w - - dm 22; id "yacpdb id 190366";
1BB5/2p2p2/2P5/5P2/1P3p1p/5pbP/2P2prp/3K2kb w - - dm 14;
1k3b1q/pP2p1p1/P1K1P1Pp/7P/2B5/8/8/8 w - - c1 "Permutation"; c3 "Kd5"; dm 27; id "Vincent Lejeune - hard CCC 2008 - Pos 29";
1kn5/p2p4/P1pP1p1q/1PP2P1P/5p2/4rQp1/K7/5B2 w - - dm 17; id "yacpdb id 276399";
1n1k4/3pN1N1/p1pP4/P1P1p3/KBP1p3/P1P1P3/8/8 w - - dm 18; id "yacpdb id 188637";
1R3rrn/4Pp1k/5Pp1/6P1/p2p4/p2p4/P2P1P2/RN2K3 w - - dm 8;
2b1n3/1qp3p1/2p1p1p1/2P3p1/pP2P1N1/P3N1P1/4PPB1/4K1k1 w - - dm 12;
2bB4/b2p2p1/2rpp3/2N1kpKp/2P1N2R/3RpP2/3Pn1n1/8 w - - dm 7; id "yacpdb id 67212";
2K3B1/8/1p6/8/7p/8/4N2p/4n2k w - - dm 7; id "yacpdb id 291988";
2K3B1/8/8/8/7p/8/4N2p/4n2k w - - dm 13; id "yacpdb id 291987";
2N1BK1n/p1p1R3/6p1/pRpk4/6p1/1P2P3/5P2/2r4b w - - dm 6;
2r5/PK1k4/8/7p/7P/6P1/8/8 b - - dm 18;
3b2N1/4p3/1p1pPp2/1P1k1Kp1/1Pp3Pp/2Pp3P/3P3P/8 w - - dm 13; id "yacpdb id 67626";
3K1R2/8/8/4B2p/8/6pp/6kp/7b w - - dm 13; id "yacpdb id 275529";
3K4/1p1B4/bB1k4/rpR1p3/2ppppp1/8/RPPPPP2/r1n5 w - - dm 7; id "ChestDB.2143";
3Nk3/3p4/3p1Q1p/5K1p/4N3/b1p1Rp2/2q1p3/r6B w - - dm 7; id "yacpdb id 67105";
4b1n1/5p2/5P2/R7/p7/K7/R2PPPP1/2k5 w - - dm 7; id "yacpdb id 188475";
4B2k/1p5p/bp5P/1p4p1/qp4P1/pp6/1r4P1/B1K5 w - - dm 16; id "yacpdb id 190065";
4B3/p6p/P2p3P/3P1kp1/2P3NP/R3K2p/1r3B1N/8 w - - dm 7; id "ChestDB.1944";
4k1r1/2pnp3/2B1N3/8/8/5R2/6P1/5K2 w - - dm 11; id "ChestDB.6571";
4k3/8/8/1p5p/1P5P/8/5K2/8 w - - dm 27;
4N1K1/8/6k1/4p1P1/4P2P/3p3P/3P4/8 w - - dm 11; id "yacpdb id 341070";
5b2/1p2p1p1/1P2p1p1/4P1Pp/8/3PB2K/7N/7k w - - dm 9; id "yacpdb id 67465";
5k2/4p2p/6P1/3K4/8/4B3/8/8 w - - c0 "level: easy-2"; c3 "Bh6+"; c4 "Be3h6+ (JenoBan_TofE) #233 white_wins"; dm 13; id "EGB 0047";
6B1/p7/4p1p1/B3PkPp/4pPpK/4P1P1/8/8 w - - dm 9; id "yacpdb id 67462";
6k1/8/5pPp/5P2/7K/8/8/8 w - - c0 "level: med-10"; c3 "Kg4"; c4 "Kh4g4 (JenoBan_TofE) #81 white_wins"; dm 34; id "EGP 0213";
6k1/8/r2BK2P/6N1/8/8/8/8 w - - c0 "level: med-14"; c2 "Ke5"; c3 "Ke5"; c4 "Ke6e5 (Adorjan_EofCE3) #973 white_wins"; dm 46; id "EG 1964";
6R1/8/8/7k/8/8/2p1p2p/2KbR3 w - - dm 7; id "yacpdb id 190059";
7k/8/2b1B2P/7P/7P/n7/8/R3K2R w - - dm 7;
7k/r4ppn/1b4p1/2pN1bB1/3qPR1R/8/2Q2PPK/8 w - - dm 7; id "ChestDB.1962";
8/1p1p1p2/1p1P1P1P/1P6/6p1/4p1p1/3pP1PB/3B1K1k w - - dm 15; id "ChestDB.6070";
8/1pR4R/1p3p2/1P2pKB1/4P3/5pp1/5ppb/6kq w - - dm 9; id "yacpdb id 292838";
8/2p1N3/2p5/2p5/P1kb2R1/4p3/P3p1P1/1B2B2K w - - dm 10;
8/2p2p2/2p2p1N/KpN1k3/6P1/P5P1/P7/8 w - - dm 12;
8/2p3B1/2P3p1/2P3pb/6p1/N3K1P1/prP5/k7 w - - dm 13; id "yacpdb id 67605";
8/2p4p/2P4P/3p2p1/B2Pp1P1/4P1Pk/3Pp1pN/3bB1K1 w - - dm 11; id "yacpdb id 192580";
8/2p5/2p1N3/1np5/Qbk1P3/1p6/bPp2P2/2N3K1 w - - dm 8; id "yacpdb id 192484";
8/2p5/2p5/2p5/2p3p1/6P1/1pP5/kb2Q2K w - - dm 10; id "yacpdb id 327637";
8/2p5/4p3/2P1p3/4P3/3p1K2/pppp1B2/rbbk2N1 w - - dm 13; id "yacpdb id 89222";
8/3B2pr/2rpR2p/1p1k4/3p4/pNP3B1/KnPNP2p/7b w - - dm 10; id "yacpdb id 188364";
8/3k4/8/5K2/6P1/8/8/8 w - - dm 12;
8/3N4/3p4/p7/Pp1kP1p1/pK6/P1PN4/7B w - - dm 9;
8/4N3/8/3p4/3p1p2/3P1N2/2B1k1K1/8 w - - dm 9; id "yacpdb id 343525";
8/4p3/3pP3/3P4/3P4/2KQ4/pppp4/rrkbb3 w - - dm 7; id "yacpdb id 312021";
8/4p3/3pPp2/pK1P1P2/1P2NP2/4p1p1/2B1pprb/4kbrn w - - dm 20; id "ChestDB.6460";
8/5K2/3p3p/3p3P/pp1P4/rkb1R3/p1p3P1/n1B2B2 w - - dm 16; id "yacpdb id 67664";
8/5p2/4pP2/3pP1p1/N2P1kP1/2P2p1P/2K2P2/8 w - - dm 8; id "yacpdb id 67325";
8/5ppp/8/5PPP/8/k7/8/K7 w - - dm 19;
8/6p1/6p1/6p1/2K3p1/6pk/5prp/5Bbb w - - dm 9;
8/6p1/p7/rp1K2p1/kb3pP1/2p2p1b/P1Np1P2/3N2R1 w - - dm 20; id "ChestDB.5699";
8/7p/6pP/5pP1/3BpP2/p1KpP3/pn1N4/k7 w - - dm 21; id "yacpdb id 67684";
8/8/2ppp3/2pkp3/2ppp3/8/4KP2/1NB2B2 w - - dm 10; id "yacpdb id 67499";
8/8/4k1K1/6R1/5P2/7r/8/8 w - - dm 30;
8/8/5p2/p2p4/Pk1P1P2/1P1p4/KB1p4/3B4 w - - dm 10; id "yacpdb id 67503";
8/8/6BR/Pr5p/2N4p/4p3/2npN3/n2k1K2 w - - dm 7; id "yacpdb id 304586";
8/8/7p/8/6pp/4N1Pk/5K2/8 w - - dm 20; id "yacpdb id 280274";
8/8/7Q/5P2/1pP5/pP1B4/P2nppp1/K1k1bqrb w - - dm 7; id "ChestDB.0807";
8/8/8/2p4k/p1Pp3P/P5K1/8/8 b - - dm 27;
8/8/8/2p5/1pp5/brpp4/qpprpK1P/1nkbn3 w - - dm 16; id "yacpdb id 67659";
8/8/8/2P5/4BB2/3P2PP/3p1kp1/3Kbrrb w - - dm 12; id "yacpdb id 190721";
8/8/8/4k3/r7/3BNP2/5K2/8 w - - c0 "level: hard-16"; c3 "Ng2"; c4 "Ne3g2 (Adorjan_EofCE3) #977 white_wins"; dm 55; id "EG 2246";
8/8/p7/8/8/2p1Nppp/K2pppbr/2krbqnn w - - dm 7; id "ChestDB.0735";
8/p1p1p3/P1P1pp1K/RR2bk2/4p1p1/4PpPb/5P2/8 w - - dm 7; id "yacpdb id 193899";
8/p7/8/8/8/3p1b2/pp1K1N2/qk6 w - - dm 18; id "yacpdb id 67672";
8/pp4p1/4k1P1/3p4/3P4/2P5/4K2P/8 w - - c0 "level: med-10"; c3 "c4"; c4 "Pc3c4 (JenoBan_TofE) #193 white_wins"; dm 24; id "EGP 0214";
b3k3/3pPpK1/3P1P2/8/8/8/6B1/8 w - - dm 24; id "yacpdb id 284304";
b7/6p1/2p5/2p3p1/p1p1p1p1/K1P1P1Pk/1BR4P/7B w - - dm 8; id "yacpdb id 67305";
k1b5/1p1p1p1p/1PpPpP2/2B5/8/2p1p2P/2PbP3/3K4 w - - dm 56; id "yacpdb id 277997";
k1b5/1p1p4/pP1Pp3/K2pPp2/1P1p1P2/3P1P2/5P2/8 w - - dm 72; id "ChestDB.6019";
k1N4n/P7/P7/P7/P7/P7/1PK5/8 w - - dm 10; id "yacpdb id 67519";
k4B1R/1p1pKp2/qp1PbP2/bp1p1p2/1p1P1P2/1P6/8/8 w - - dm 9; id "yacpdb id 327394";
k7/1pP2r2/1P6/8/8/K5PR/1PPPPP2/8 b - - dm 18; id "ChestDB.6654";
k7/8/Kp1N2q1/8/8/R7/7P/8 b - - dm 36;
k7/p6p/P3N2K/4B3/8/7N/2P3PP/8 w - - dm 7;
kBb5/PpPp1p1p/1p1P1P1P/1P3PpK/8/8/8/6R1 w - g6 dm 16; id "ChestDB.5495";
KBb5/PpPp4/pP1PN3/R1p4p/1k1P3P/R7/8/8 w - - dm 7;
N2b4/3B4/3p4/3k4/P2P4/P1pPP3/P1p5/RbK5 w - - c1 "Permutation"; dm 7; id "yacpdb id 190003";
n2Bqk2/5p1p/Q4KP1/p7/8/8/8/8 w - - c0 "M. Matous, 1.hm Szachy 1975 White to play and win"; dm 13; id "yacpdb id 276295";
N6R/rp5q/kp6/1p1p4/1p1p4/1N1P4/1KPP3P/8 w - - dm 7; id "yacpdb id 99581";
n7/2p5/1pp5/b1p5/pkp5/N1p5/P1K5/2B5 w - - dm 7; id "yacpdb id 311988";
nk6/2p2pP1/KpP2P2/1Pp2P2/2P2P2/5P2/8/4B1q1 w - - dm 17; id "yacpdb id 188798";
r4BK1/6P1/1p1p3P/3P4/2k5/p2N1q2/P7/8 w - - dm 24; id "yacpdb id 37311";
rnbqkbnr/pppppppp/6B1/1Q6/B5BB/2N5/8/R2QKBNR w KQkq - dm 6;

[jhellis3]

Could you provide the solution to this one:

k1b5/1p1p1p1p/1PpPpP2/2B5/8/2p1p2P/2PbP3/3K4 w - -

[Dann Corbit]

It's a famous problem by Otto Titusz Blathy from 1890.
http://www.open-chess.org/viewtopic.php?f=38&t=2302

I think you can find any of the problems in the list with a web search, though there might be one or two exceptions.

[Dann Corbit]

It's a famous problem by Otto Titusz Blathy from 1890.
http://www.open-chess.org/viewtopic.php?f=38&t=2302

I think you can find any of the problems in the list with a web search, though there might be one or two exceptions.

For some real fun, put:
Bláthy, Ottó Titusz
Into the author slot here:
http://www.yacpdb.org/#SearchSplash