| Ply | 0 | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| unique | - | - | - | - | - | 3 | 51 | 1110 | 3871 | 47766 | 219708 | 2110237 |
| mate 0 | - | - | - | - | 4 | 105 | 1251 | 26633 | 215854 | 3612868 | 26105519 | 350188023 |
| mate 1 | - | - | - | 4 | 116 | 1400 | 31994 | 268482 | 4811125 | 35961557 | 514249593 | |
| mate -1 | - | - | - | - | 4 | 88 | 854 | 12204 | 97182 | 1204117 | 9251300 | |
| mate 2 | - | - | - | 4 | 93 | 901 | 13750 | 109302 | 1416378 | 10728891 | 128966312 | |
| mate -2 | - | - | - | - | - | 13 | 133 | 2693 | 24458 | 367968 | ||
| mate 3 | - | - | - | - | 13 | 132 | 2852 | 24565 | 370317 | 3197657 | ||
| mate -3 | - | - | - | - | - | - | 7 | 225 | 5758 | >=80338 | ||
| mate 4 | - | - | - | - | - | 6 | 200 | 4861 | 90729 | >=5041 | ||
| mate -4 | - | - | - | - | - | - | 3 | 155 | >=3341 | >=7080 | ||
| mate 5 | - | - | - | - | - | 3 | 162 | 3559 | >=256 | >=2385 | ||
| mate -5 | - | - | - | - | - | - | 2 | >=201 | >=1717 | >=5186 | ||
| mate 6 | - | - | - | - | - | 2 | 225 | >=2872 | >=75 | >=856 | ||
| mate -6 | - | - | - | - | - | - | >=2 | >=79 | >=658 | >=3653 | ||
| mate 7 | - | - | - | - | - | 2 | >=60 | >=1225 | >=51 | >=352 | ||
| mate -7 | - | - | - | - | - | >=3 | >=53 | >=300 | ||||
| mate 8 | - | - | - | - | >=2 | >=34 | >=459 | >=22 | ||||
| mate -8 | - | - | - | - | >=26 | >=147 | ||||||
| mate 9 | - | - | - | >=17 | >=51 | |||||||
| mate -9 | - | - | - | >=1 | >=19 | |||||||
| mate 10 | - | - | >=1 | >=18 | >=12 | |||||||
| mate -10 | - | - | ||||||||||
| mate 11 | - | >=11 | ||||||||||
| mate -11 | ||||||||||||
| mate 12 | ||||||||||||
| mate -12 | ||||||||||||
| mate 13 | ||||||||||||
| mate -13 | ||||||||||||
| mate 14 | ||||||||||||
| mate -14 | ||||||||||||
| mate 15 | ||||||||||||
| mate -15 |
Number of games:
| Ply | 0 | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | OEIS |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| mate 0 | - | - | - | - | 8 | 347 | 10828 | 435767 | 9852036 | 400191963 | 8790619155 | 362290010907 | 8361091858959 | 346742245764219 | A079485 |
| mate 1 | - | - | - | 8 | 347 | 10822 | 419046 | 9581293 | 377316151 | 8391307628 | 339181405568 | ||||
| mate -1 | - | - | - | - | 8 | 315 | 8212 | 269465 | 5324016 | 175265641 | 3520797365 | ||||
| mate 2 | - | - | - | 8 | 303 | 7891 | 247827 | 4898320 | 153916676 | 3105258919 | 103832671608 | ||||
| mate -2 | - | - | - | - | - | 25 | 547 | 30882 | 665748 | 29852605 | |||||
| mate 3 | - | - | - | - | 25 | 540 | 29087 | 615559 | 25569085 | 583378970 | |||||
| mate -3 | - | - | - | - | - | - | 19 | 1659 | 79190 | ||||||
| mate 4 | - | - | - | - | - | 18 | 1403 | 67065 | 3777489 | ||||||
| mate -4 | - | - | - | - | - | - | 14 | 1466 | |||||||
| mate 5 | - | - | - | - | - | 14 | 1383 | 52184 | |||||||
| mate -5 | - | - | - | - | - | - | 5 | ||||||||
| mate 6 | - | - | - | - | - | 5 | 1683 | ||||||||
| mate -6 | - | - | - | - | - | - | |||||||||
| mate 7 | - | - | - | - | - | 12 | |||||||||
| mate -7 | - | - | - | - | - | ||||||||||
| mate 8 | - | - | - | - | |||||||||||
| mate -8 | - | - | - | - | |||||||||||
| mate 9 | - | - | - | ||||||||||||
| mate -9 | - | - | - | ||||||||||||
| mate 10 | - | - | |||||||||||||
| mate -10 | - | - | |||||||||||||
| mate 11 | - |
Number of games, number of different positions, number of positions seen in earlier ply, number of different positions not seen in earlier ply and unique positions that can be obtained in exactly one way in n plies:
| Ply | 0 | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | OEIS |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| perft | 1 | 20 | 400 | 8902 | 197281 | 4865609 | 119060324 | 3195901860 | 84998978956 | 2439530234167 | 69352859712417 | 2097651003696806 | 62854969236701747 | 1981066775000396239 | 61885021521585529237 | 2015099950053364471960 | A048987 |
| positions | 1 | 20 | 400 | 5362 | 72078 | 822518 | 9417681 | 96400068 | 988187354 | 9183421888 | 85375278064 | 726155461002 | A083276 | ||||
| also earlier | 0 | 0 | 0 | 0 | 65 | 1502 | 34631 | 488287 | 6858751 | 77043483 | 860814440 | 8350125374 | - | ||||
| positions-earlier | 1 | 20 | 400 | 5362 | 72013 | 821016 | 9383050 | 95911781 | 981328603 | 9106378405 | 84514463624 | 717805335628 | - | ||||
| sum(positions-earlier): legal positions <= |
1 | 21 | 421 | 5783 | 77796 | 898812 | 10281862 | 106193643 | 1087522246 | 10193900651 | 94708364275 | 812513699903 | - | ||||
| unique | 1 | 20 | 400 | 1862 | 9825 | 53516 | 311642 | 2018993 | 12150635 | 69284509 | 382383387 | 1994236773 | A089957 |
Earliest mate in N positions:
| Mate distance | is earliest | status | ply | fen |
|---|---|---|---|---|
| mate 0 | yes | Chest | 4 | rnb1kbnr/pppp1ppp/4p3/8/5PPq/8/PPPPP2P/RNBQKBNR w KQkq - |
| mate 1 | yes | Chest | 3 | rnbqkbnr/pppp1ppp/4p3/8/5PP1/8/PPPPP2P/RNBQKBNR b KQkq - acn 1; acs 0; bm Qh4#; ce 32766; dm 1; pv Qh4#; |
| mate -1 | yes | Chest | 4 | rnb1kbnr/pppp1ppp/4p3/8/5P1q/7P/PPPPP1P1/RNBQKBNR w KQkq - acn 2; acs 0; ce -32765; pv g3 Qxg3#; |
| mate 2 | yes | Chest | 3 | rnbqkbnr/pppp1ppp/4p3/8/5P2/7P/PPPPP1P1/RNBQKBNR b KQkq - acn 6; acs 0; bm Qh4+; ce 32764; dm 2; pv Qh4+ g3 Qxg3#; |
| mate -2 | yes | Chest | 5 | r1bqkbnr/ppppp1pp/2n2p2/7Q/8/3BP3/PPPP1PPP/RNB1K1NR b KQkq - acn 4; acs 0; ce -32763; pv g6 Bxg6+ hxg6 Qxg6#; |
| mate 3 | yes | Chest | 4 | r1bqkbnr/ppppp1pp/2n2p2/8/8/3BP3/PPPP1PPP/RNBQK1NR w KQkq - acn 643; acs 0; bm Qh5+; ce 32762; dm 3; pv Qh5+ g6 Bxg6+ hxg6 Qxg6#; |
| mate -3 | yes | Chest | 6 | rnb1k1nr/pppp1ppp/3bp3/6q1/8/3PK3/PPP1PPPP/RNBQ1BNR w kq - acn 205; acs 0; ce -32761; pv Kd4 Nc6+ Ke4 f5+ Kf3 Nd4#; |
| mate 4 | yes | Chest | 5 | rnbqk1nr/pppp1ppp/3bp3/8/8/3PK3/PPP1PPPP/RNBQ1BNR b kq - acn 19641; acs 0; bm Qg5+; ce 32760; dm 4; pv Qg5+ Ke4 Nf6+ Kf3 Qf5+ Bf4 Qxf4#; |
| mate -4 | yes | Chest | 6 | rnb1k1nr/pppp1ppp/4p3/2b5/4PP1q/7P/PPPP2P1/RNBQKBNR w KQkq - acn 1019; acs 0; ce -32759; pv g3 Qxg3+ Ke2 Qf2+ Kd3 Qd4+ Ke2 Qxe4#; |
| mate 5 | yes | Chest | 5 | rnb1kbnr/ppp1pppp/3q4/3pP3/8/8/PPPPKPPP/RNBQ1BNR b kq - acn 119028; acs 0; bm Qxe5+; ce 32758; dm 5; pv Qxe5+ Kf3 Qf5+ Kg3 Qg5+ Kf3 Qg4+ Ke3 Qe4#; |
| mate -5 | yes | Chest | 6 | r1bqk1nr/pppp1ppp/2n5/4p3/1b6/2KP4/PPP1PPPP/RNBQ1BNR w kq - acn 85382; acs 0; ce -32757; pv Kc4 d5+ Kb3 Nd4+ Kxb4 c5+ Ka4 b5+ Ka3 Qa5#; |
| mate 6 | yes | Chest | 5 | r1bqkbnr/pppp1ppp/2n5/4p3/8/2KP4/PPP1PPPP/RNBQ1BNR b kq - acn 6597203; acs 8; bm Bb4+; ce 32756; dm 6; pv Bb4+ Kb3 Nd4+ Kxb4 c5+ Kc4 d5+ Kxc5 a5 h3 b6#; |
| mate -6 | yes | Chest | 6 | rnb1k1nr/pppp1ppp/4p3/2b5/5P1q/3P3P/PPP1P1P1/RNBQKBNR w KQkq - acn 882865; acs 1; ce -32755; pv g3 Qxg3+ Kd2 Qxf4+ e3 Qxe3+ Kc3 Qd4+ Kd2 Qf4+ Ke2 Qf2#; |
| mate 7 | yes | Chest | 5 | rnbqk1nr/pppp1ppp/4p3/2b5/5P2/3P3P/PPP1P1P1/RNBQKBNR b KQkq - acn 64803141; acs 120; bm Qh4+; ce 32754; dm 7; pv Qh4+ g3 Qxg3+ Kd2 Qxf4+ e3 Qxe3+ Kc3 Qd4+ Kd2 Qf4+ Ke2 Qf2#; |
| mate -7 | probably | Chest | 6 | r1b1kbnr/pp1ppppp/n1p5/q7/8/2KP4/PPP1PPPP/RNBQ1BNR w kq - acn 25467733; acs 35; ce -32753; Kd4 Qc5+ Ke4 Qxf2 d4 Nb4 Nf3 Nf6+ Kf4 Nbd5+ Kf5 g6+ Kg5 h6#; |
| mate 8 | probably | Chest | 5 | r1bqkbnr/pp1ppppp/n1p5/8/8/2KP4/PPP1PPPP/RNBQ1BNR b kq - acn 851808811; acs 1829; bm Qa5+; ce 32752; dm 8; pv Qa5+ Kd4 Qc5+ Ke4 Qxf2 d4 Nb4 Nf3 Nf6+ Kf4 Nbd5+ Kf5 g6+ Kg5 h6#; |
| mate -8 | perhaps | Chest | 7 | r1bqkbnr/pppppBp1/n6p/5P2/8/8/PPPP1PPP/RNBQK1NR b KQkq - acn 18539276; acs 39; ce -32751; pv Kxf7 Qh5+ Kf6 Qg6+ Ke5 Nf3+ Kd5 Nc3+ Kc5 d4+ Kc4 Nd2+ Kxd4 Nb3+ Kc4 Qg4#; |
| mate 9 | perhaps | Chest | 6 | rnbq1bnr/ppp1pppp/2kp4/4P3/8/2P5/PP1P1PPP/RNBQKBNR w KQ - acn 6648213132; acs 14563; bm Qa4+; ce 32750; dm 9; pv Qa4+ Kd5 d4 Ke6 d5+ Kxd5 Qc4+ Kxe5 Qxf7 e6 Qf4+ Kd5 Qc4+ Ke5 Qd4+ Kf5 Bd3#; |
| mate -9 | probably | Chest | 6 | rnb1k1nr/pppp1ppp/8/4p1q1/1b1P4/4K3/PPP1PPPP/RNBQ1BNR w kq - acn 529906984; acs 1352; ce -32749; pv Kd3 e4+ Kc4 b5+ Kxb4 a5+ Kb3 a4+ Kc3 b4+ Kc4 Ba6+ Kxb4 Nc6+ Ka3 Qe7+ b4 Qxb4#; |
| mate 10 | probably | Chest | 5 | rnbqk1nr/pppp1ppp/8/4p3/1b1P4/4K3/PPP1PPPP/RNBQ1BNR b kq - acn 294518230988; acs 454985; bm Qg5+; ce 32748; dm 10; pv Qg5+ Kd3 e4+ Kc4 b5+ Kxb4 a5+ Kb3 a4+ Kc3 b4+ Kc4 Ba6+ Kxb4 Nc6+ Ka3 Qe7+ b4 Qxb4#; |
| mate-10 | perhaps | Below | 7 | rn1qkbnr/p1p1pBpp/1p1p4/8/4P3/5Q1b/PPPP1PPP/RNB1K1NR b KQkq - ce -32747; pv Kd7 Qxh3+ e6 Qxe6+ Kc6 Qd5+ Kd7 Qf5+ Kc6 Bd5+ Kb5 Qf3 Qe8 c4+ Ka5 b4+ Ka6 Qa3+ Qa4 Qxa4#; |
| mate 11 | perhaps | Chest | 6 | rn1qkbnr/p1p1pppp/1p1p4/8/2B1P3/5Q1b/PPPP1PPP/RNB1K1NR w KQkq - acn 7824958670412; acs 11255608; bm Bxf7+; ce 32746; dm 11; pv Bxf7+ Kd7 Qxh3+ e6 Qxe6+ Kc6 Qd5+ Kd7 Qf5+ Kc6 Bd5+ Kb5 Qf3 Qe8 c4+ Ka5 b4+ Ka6 Qa3+ Qa4 Qxa4#; |
| mate-11 | perhaps | Below | 6 | rnb1k1nr/pppp1ppp/4pq2/2b5/4P3/5K2/PPPP1PPP/RNBQ1BNR w kq -; pv Kg4 g5 d4 Qxf2 Bxg5 h5+ Kh3 e5 Bb5 Nc6 Qf3 d6+ Qf5 Bxf5+ exf5 Qxf5+ Kg3 h4+ Bxh4 Qf4+ Kh3 Rxh4#; |
| mate 12 | probably | Huntsman1 >119Gn | 5 | rnbqk1nr/pppp1ppp/4p3/2b5/4P3/5K2/PPPP1PPP/RNBQ1BNR b kq - acn 2583305; pv Qf6+ Kg4 g5 d4 Qxf2 Bxg5 h5+ Kh3 e5 Bb5 Nc6 Qf3 d6+ Qf5 Bxf5+ exf5 Qxf5+ Kg3 h4+ Bxh4 Qf4+ Kh3 Rxh4#; |
| mate-12 | unknown | Huntsman1 >52Gn | 7 | r1bqkbnr/ppp1pBp1/n2p3p/7Q/4P3/8/PPPP1PPP/RNB1K1NR b KQkq - acn 144718; pv Kd7 Be6+ Kc6 Qd5+ Kb6 Qb3+ Ka5 Na3 Nb4 Nc4+ Kb5 Ne2 Kc6 Qa4+ b5 Nd4+ Kc5 Qxb5+ Kxd4 c3+ Kd3 Ne3+ Kxe4 Qf5#; |
| mate 13 | perhaps | Huntsman1 >106Gn | 6 | rnbqkbn1/ppppp1pr/5p2/7p/P3P3/8/1PPPBPPP/RNBQK1NR w KQq - acn 4479714; pv Bxh5+ g6 Bxg6+ Rf7 Bxf7+ Kxf7 Qh5+ Kg7 Ra3 Nh6 d4 Kh8 Bxh6 c6 Rg3 Qa5+ Qxa5 d5 Qd8 Nd7 Bxf8 Nxf8 Qxf8+ Kh7 Qg7#; |
| mate-13 | unknown | Below | 7 | 1nbqkbnr/rppppB1p/p7/6p1/4P3/7N/PPPP1PPP/RNBQK2R b KQk -; pv Kxf7 Qh5+ Kf6 Qxg5+ Kf7 Qh5+ Kg7 Qg4+ Kf6 e5+ Kf7 Ng5+ Kg6 Nf3+ Kf7 e6+ Kf6 Qf4+ Kxe6 Nd4+ Kd5 Nc3+ Kc5 b4+ Kxb4 Nb3#; |
| mate 14 | perhaps | Huntsman1 >74Gn | 6 | 1nbqkbnr/rppppp1p/p7/6p1/2B1P3/7N/PPPP1PPP/RNBQK2R w KQk - acn 153326; pv Bxf7+ Kxf7 Qh5+ Kf6 Qxg5+ Kf7 Qh5+ Kg7 Qg4+ Kf6 e5+ Kf7 Ng5+ Kg6 Nf3+ Kf7 e6+ Kf6 Qf4+ Kxe6 Nd4+ Kd5 Nc3+ Kc5 b4+ Kxb4 Nb3#; |
| mate-14 | perhaps | Below | 7 | rnbqkbnr/pppppB1p/8/6p1/4P3/7N/PPPP1PPP/RNBQK2R b KQkq -; pv Kxf7 Qh5+ Kg7 Qxg5+ Kf7 Qh5+ Kg7 Qg4+ Kf6 e5+ Kf7 Ng5+ Kg7 Nf3+ Kf7 e6+ Kf6 Qf4+ Kxe6 Nd4+ Kd5 Nc3+ Kc5 Nb3+ Kb6 Qb4+ Ka6 Qb5#; |
| mate 15 | perhaps | Huntsman1 >100Gn | 6 | rnbqkbnr/pppppp1p/8/6p1/2B1P3/7N/PPPP1PPP/RNBQK2R w KQkq - acn 269271; pv Bxf7+ Kxf7 Qh5+ Kg7 Qxg5+ Kf7 Qh5+ Kg7 Qg4+ Kf6 e5+ Kf7 Ng5+ Kg7 Nf3+ Kf7 e6+ Kf6 Qf4+ Kxe6 Nd4+ Kd5 Nc3+ Kc5 Nb3+ Kb6 Qb4+ Ka6 Qb5#; |
| mate-15 | perhaps | Below | 7 | rn1qkbnr/pbpppB1p/1p6/6p1/4P3/7N/PPPP1PPP/RNBQK2R b KQkq -; pv Kxf7 Qh5+ Kg7 Qxg5+ Kf7 Qh5+ Kg7 Qg4+ Kf6 e5+ Kxe5 Qf4+ Kd5 Nc3+ Kc6 Qc4+ Kd6 Nb5+ Ke5 Qf4+ Kd5 d3 Nf6 g4 c5 Qf3+ Ke6 Ng5+ Ke5 Qf5#; |
| mate 16 | perhaps | Huntsman1 >104Gn | 6 | rn1qkbnr/pbpppp1p/1p6/6p1/2B1P3/7N/PPPP1PPP/RNBQK2R w KQkq - acn 18351060; pv Bxf7+ Kxf7 Qh5+ Kg7 Qxg5+ Kf7 Qh5+ Kg7 Qg4+ Kf6 e5+ Kxe5 Qf4+ Kd5 Nc3+ Kc6 Qc4+ Kd6 Nb5+ Ke5 Qf4+ Kd5 d3 Nf6 g4 c5 Qf3+ Ke6 Ng5+ Ke5 Qf5#; |
| mate-16 | unknown | Huntsman1 >118Gn | 8 | rnb1k1nr/pppp1ppp/8/2b5/4p2q/3PK3/PPPNPPPP/R1BQ1BNR w kq - acn 11444638; pv d4 Bxd4+ Kxd4 Nc6+ Ke3 Qg5+ f4 Qc5+ Kxe4 Nf6+ Kf3 Nd4+ Kg3 Nh5+ Kh4 Qe7+ Kh3 Nxf4+ Kg3 Qe3+ Ndf3 Nf5+ Kg4 h5+ Kxf5 d6+ Kg5 f6+ Kh4 g5+ Nxg5 Ng6#; |
| mate 17 | unlikely | Below | 13 | r1bqk1nr/p1pp1ppp/3bp3/1p6/3n4/2KP4/PPP1PPPP/RNBQ1BNR b kq -; pv Bb4+ Kxd4 Ne7 g4 Bb7 Ke3 Nd5+ Kf3 Qf6+ Kg3 Bd6+ Kh3 Ne3 Bxe3 h5 f3 hxg4+ Kg2 Qh4 Nh3 Qxh3+ Kf2 Qh4+ Kg2 Bxh2 Bf4 g3 Bh6 Rxh6 Rg1 Bxg1 Kxg1 Qh1#; |
| mate-17 | unlikely | Below | 12 | r1bqk1nr/p1pp1ppp/3bp3/1p6/3n4/1K1P4/PPP1PPPP/RNBQ1BNR w kq -; pv Kc3 Bb4+ Kxd4 Ne7 g4 Bb7 Ke3 Nd5+ Kf3 Qf6+ Kg3 Bd6+ Kh3 Ne3 Bxe3 h5 f3 hxg4+ Kg2 Qh4 Nh3 Qxh3+ Kf2 Qh4+ Kg2 Bxh2 Bf4 g3 Bh6 Rxh6 Rg1 Bxg1 Kxg1 Qh1#; |
| mate 18 | unlikely | Below | 11 | r1bqk1nr/p1pp1ppp/2nbp3/1p6/8/1K1P4/PPP1PPPP/RNBQ1BNR b kq -; pv Nd4+ Kc3 Bb4+ Kxd4 Ne7 g4 Bb7 Ke3 Nd5+ Kf3 Qf6+ Kg3 Bd6+ Kh3 Ne3 Bxe3 h5 f3 hxg4+ Kg2 Qh4 Nh3 Qxh3+ Kf2 Qh4+ Kg2 Bxh2 Bf4 g3 Bh6 Rxh6 Rg1 Bxg1 Kxg1 Qh1#; |
| mate-18 | unlikely | Below | 10 | r1bqk1nr/p1pp1ppp/2nbp3/1p6/2K5/3P4/PPP1PPPP/RNBQ1BNR w kq -; pv Kb3 Nd4+ Kc3 Bb4+ Kxd4 Ne7 g4 Bb7 Ke3 Nd5+ Kf3 Qf6+ Kg3 Bd6+ Kh3 Ne3 Bxe3 h5 f3 hxg4+ Kg2 Qh4 Nh3 Qxh3+ Kf2 Qh4+ Kg2 Bxh2 Bf4 g3 Bh6 Rxh6 Rg1 Bxg1 Kxg1 Qh1#; |
| mate 19 | unlikely | Below | 9 | r1bqk1nr/pppp1ppp/2nbp3/8/2K5/3P4/PPP1PPPP/RNBQ1BNR b kq -; pv b5+ Kb3 Nd4+ Kc3 Bb4+ Kxd4 Ne7 g4 Bb7 Ke3 Nd5+ Kf3 Qf6+ Kg3 Bd6+ Kh3 Ne3 Bxe3 h5 f3 hxg4+ Kg2 Qh4 Nh3 Qxh3+ Kf2 Qh4+ Kg2 Bxh2 Bf4 g3 Bh6 Rxh6 Rg1 Bxg1 Kxg1 Qh1#; |
| mate-19 | unknown | Huntsman1 >108Gn | 8 | r1bqk1nr/pppp1ppp/2nbp3/8/3K4/3P4/PPP1PPPP/RNBQ1BNR w kq - acn 114233250; pv Kc4 b5+ Kb3 Nd4+ Kc3 Bb4+ Kxd4 Ne7 g4 Bb7 Ke3 Nd5+ Kf3 Qf6+ Kg3 Bd6+ Kh3 Ne3 Bxe3 h5 f3 hxg4+ Kg2 Qh4 Nh3 Qxh3+ Kf2 Qh4+ Kg2 Bxh2 Bf4 g3 Bh6 Rxh6 Rg1 Bxg1 Kxg1 Qh1#; |
| mate 20 | unlikely | Below | 9 | rnb1kbnr/pppp1ppp/8/4p1q1/8/3P1K2/PPPBPPPP/RN1Q1BNR b kq -; pv Qf5+ Kg3 Qg6+ Kf3 e4+ Ke3 Bc5+ d4 Bxd4+ Kxd4 Nc6+ Kc3 Qf6+ Kb3 Nd4+ Kc3 Ne6+ Kb3 Nc5+ Ka3 Qa6+ Kb4 Ne7 b3 Nd5+ Kxc5 Qd6+ Kd4 f5 e3 c5+ Kc4 Nb6+ Kb5 Qc6+ Ka5 Nc4+ bxc4 b6#; |
| mate-20 | unknown | Huntsman1 >456Gn | 8 | rnb1kbnr/pppp1ppp/8/4p1q1/8/3PK3/PPPBPPPP/RN1Q1BNR w kq - acn 6379502; pv Kf3 Qf5+ Kg3 Qg6+ Kf3 e4+ Ke3 Bc5+ d4 Bxd4+ Kxd4 Nc6+ Kc3 Qf6+ Kb3 Nd4+ Kc3 Ne6+ Kb3 Nc5+ Ka3 Qa6+ Kb4 Ne7 b3 Nd5+ Kxc5 Qd6+ Kd4 f5 e3 c5+ Kc4 Nb6+ Kb5 Qc6+ Ka5 Nc4+ bxc4 b6#; |