## Perft numbers for atomic
| 1 | 20 | 400 | 8902 | 197326 | 4864979 | 118926425 | `rnbqkbnr/pppppppp/8/8/8/8/PPPPPPPP/RNBQKBNR w KQkq - 0 1` |
| 2 | 37 | 1191 | 43364 | 1402237 | 51225398 | 1667574955 | `rnbqkbnr/ppp2pp1/4p2p/3p4/3PP3/7N/PPP2PPP/RNBQKB1R w KQkq - 0 4` |
| 3 | 5 | 156 | 4848 | 150519 | 4643560 | 146715064 | `rnb1kb1r/p5p1/2pNp2p/1p1q1p2/3P1Pn1/N5P1/PPP4P/R1BQKB1R b KQkq - 6 10` |
| 4 | 21 | 546 | 10566 | 269557 | 5470489 | 139075307 | `r4b1r/p1N1k1p1/2pNp2p/5p2/1n1P1P2/6PP/PP6/R1B1K3 b Q - 4 17` |
| 5 | 18 | 233 | 4307 | 63774 | 1178188 | 19292503 | `r1k4r/p4Np1/N1p1p2p/5p2/3P1P2/6PP/8/5K2 w - - 0 22` |
| 6 | 15 | 260 | 4114 | 70412 | 1123137 | 20277102 | `r1k1r3/p5p1/N1p4p/2N2p2/5P2/6PP/8/5K2 w - - 2 25` |
| 7 | 11 | 202 | 2388 | 41979 | 510726 | 9323466 | `r1k5/p7/N1p5/2N4p/7P/8/5r2/4K3 w - - 0 31` |
| 8 | 12 | 90 | 1037 | 10737 | 120067 | 1581592 | `r2k4/p7/N1p5/7p/7P/8/2K5/8 w - - 2 34` |
| 9 | 11 | 227 | 2472 | 48708 | 530284 | 10261578 | `3r4/8/8/5k1p/4KN1P/p1p5/8/8 w - - 6 44` |
| 10 | 10 | 386 | 3513 | 124504 | 1106412 | 38665634 | `5r2/8/4k1N1/4K2p/7P/p7/8/2q5 w - - 0 48` |
| 11 | 3 | 166 | 1136 | 60502 | 448630 | 22312112 | `8/4N3/8/4K2p/1r3qkP/8/8/q7 w - - 16 59` |
| 12 | 57 | 463 | 25637 | 210798 | 11357575 | 96323713 | `8/4N3/8/7p/1r3q1P/6K1/7k/q7 b - - 21 61` |
| 13 | 31 | 1441 | 42110 | 1792336 | 53833718 | 2160817389 | `rnbqkbnr/ppp4p/4p1p1/3pNp2/7Q/4P3/PPPP1PPP/RNB1KB1R b KQkq - 1 5` |
| 14 | 23 | 608 | 14685 | 378875 | 9587386 | 245931633 | `r1b1Brk1/ppp5/6pp/3p4/5p2/P3PP2/1P4PP/R4RK1 b - - 1 15` |
| 15 | 23 | 707 | 16751 | 471448 | 11427491 | 310158926 | `r4r1k/pp3B2/4b1pp/2p1P3/1P3p2/P2p1P2/6PP/R4RK1 w - - 0 20` |
| 16 | 23 | 965 | 21643 | 854531 | 19827612 | 756117034 | `r4r1k/pp3B2/4b1pp/4P3/5p2/P4P2/6PP/2Rq1RK1 w - - 0 22` |
| 17 | 12 | 297 | 3734 | 84435 | 1105307 | 24470903 | `5r1k/pp3B2/4b1pp/4P3/5p2/P4P2/6PP/6K1 w - - 0 25` |
| 18 | 9 | 197 | 1822 | 37808 | 367216 | 7678919 | `5r1k/p7/4P1pp/8/8/P4P2/1p5P/6K1 w - - 0 31` |
| 19 | 2 | 74 | 906 | 29053 | 342968 | 10540700 | `5r1k/p3P3/6pp/8/8/P4P2/7P/1q4K1 w - - 0 32` |
| 20 | 37 | 448 | 14380 | 168912 | 5204468 | 63469761 | `5r1k/p3P3/6pp/8/8/P4P2/6KP/1q6 b - - 1 32` |
| 21 | 29 | 910 | 25558 | 801574 | 22933256 | 729656414 | `r1bqkbnr/pppp2pp/2n5/4ppB1/1P1P4/7N/P1P1PPPP/RN1QKB1R b KQkq - 1 4` |
| 22 | 28 | 1010 | 27065 | 967029 | 25911511 | 916719972 | `r1b1kbnr/pppp1Np1/2n5/5p1p/1P1Pp3/4P3/P1P2PPP/RN1QKB1R b KQkq - 1 7` |
| 23 | 31 | 863 | 26235 | 762155 | 22943916 | 682368919 | `r1b2rk1/ppp3p1/5n2/3p3p/1PBPpp2/4PP1P/P1P3P1/RN1QK2R w KQ - 0 12` |
| 24 | 33 | 880 | 29511 | 825695 | 27551989 | 792156382 | `r1b2rk1/ppp5/5n2/3p2pp/1PBP4/4P2P/P1P5/RN1Q1R1K w - - 0 15` |
| 25 | 15 | 330 | 5687 | 142002 | 2730671 | 71767349 | `r1b4k/pp6/8/3p2pp/1P6/2P1P2P/P7/RQ5K b - - 0 20` |
| 26 | 29 | 827 | 23310 | 631102 | 16852028 | 454615656 | `5r1k/pp6/8/3p1bpp/1P6/2P1P2P/P7/R4QK1 b - - 4 22` |
| 27 | 14 | 239 | 3404 | 60053 | 870201 | 15433879 | `7k/pp6/8/1PP5/6pp/7P/P3b3/4R1K1 b - - 0 28` |
| 28 | 2 | 28 | 324 | 5073 | 64138 | 1043068 | `8/pp6/7k/1PP4R/P7/7p/7K/5b2 b - - 6 33` |
| 29 | 2 | 28 | 350 | 5356 | 68206 | 1076078 | `8/8/7k/P6R/8/7p/4b2K/8 b - - 7 42` |
| 30 | 1 | 17 | 79 | 1340 | 5890 | 98983 | `8/8/8/8/5R2/6kp/7K/8 b - - 3 47` |
| 31 | 5 | 181 | 6303 | 224990 | 7772721 | 277004772 | `r1bqk2r/pp4pp/2p5/1B1p1pNQ/1b3P2/2N1P3/PP3nPP/R1B1K2R b KQkq - 2 11` |
| 32 | 34 | 855 | 27664 | 686943 | 22058800 | 555521643 | `r1b2rk1/1p4pp/p1p5/1B3p2/Pb1p1P2/2N1P1PP/1P3n2/R1B2RK1 b - - 0 15` |
| 33 | 40 | 1234 | 49003 | 1400960 | 54748199 | 1516837058 | `r4rk1/1p4pp/p1p1b3/5p2/PbB2P2/BPN1P1PP/3p1n2/R4RK1 b - - 3 18` |
| 34 | 3 | 92 | 1539 | 47190 | 834846 | 25617807 | `r5k1/1p4pp/p1p5/8/P4P2/BP4PP/5n2/R2r2K1 w - - 1 22` |
| 35 | 24 | 429 | 9869 | 165564 | 3716784 | 59627662 | `r5k1/7p/p2B2p1/1pp2P2/P7/1P1n2PP/8/6K1 b - - 0 26` |
| 36 | 4 | 68 | 994 | 17755 | 237457 | 4383720 | `r5k1/7p/p2B4/2p3P1/Pp5P/1P5n/8/6K1 w - - 1 30` |
| 37 | 19 | 284 | 5158 | 69627 | 1261700 | 16786223 | `r5k1/7p/p2B3P/6P1/Ppp2n2/1P6/8/5K2 b - - 0 32` |
| 38 | 16 | 334 | 5634 | 109523 | 1935593 | 36982245 | `r7/5k1P/p2B4/8/Pp3n2/1Pp5/8/5K2 w - - 1 35` |
| 39 | 19 | 232 | 3988 | 47943 | 806923 | 9847056 | `8/5k2/p7/8/Pp3n2/1P6/1Bp5/5K2 b - - 1 37` |
| 40 | 5 | 104 | 617 | 12067 | 74716 | 1474233 | `8/5k2/p7/8/P7/1P1n4/2p5/5K2 w - - 0 39` |
| 41 | 37 | 221 | 7705 | 43529 | 1454618 | 7991027 | `8/5k2/p7/8/P7/1P1n1K2/8/2q5 b - - 1 40` |