[perft] A script that checks a list of positions against known node counts

A small Python script that reads a JSON list of positions and their known Perft node counts to a certain depth, then invokes the Perft program for each position and validates the output. Peter Ellis Jones shared such a JSON list on GitHub. Import that file.
2025-06-11 08:16:37 -07:00 · 2025-06-11 08:16:37 -07:00 · 3c31f900ea
commit 3c31f900ea
parent 9815a63ebb
2 changed files with 197 additions and 0 deletions
--- a/perft/data/peterellisjones-perft-positions.json
+++ b/perft/data/peterellisjones-perft-positions.json
@ -0,0 +1,117 @@
+[
+   {
+      "depth":1,
+      "nodes":8,
+      "fen":"r6r/1b2k1bq/8/8/7B/8/8/R3K2R b KQ - 3 2"
+   },
+   {
+      "depth":1,
+      "nodes":8,
+      "fen":"8/8/8/2k5/2pP4/8/B7/4K3 b - d3 0 3"
+   },
+   {
+      "depth":1,
+      "nodes":19,
+      "fen":"r1bqkbnr/pppppppp/n7/8/8/P7/1PPPPPPP/RNBQKBNR w KQkq - 2 2"
+   },
+   {
+      "depth":1,
+      "nodes":5,
+      "fen":"r3k2r/p1pp1pb1/bn2Qnp1/2qPN3/1p2P3/2N5/PPPBBPPP/R3K2R b KQkq - 3 2"
+   },
+   {
+      "depth":1,
+      "nodes":44,
+      "fen":"2kr3r/p1ppqpb1/bn2Qnp1/3PN3/1p2P3/2N5/PPPBBPPP/R3K2R b KQ - 3 2"
+   },
+   {
+      "depth":1,
+      "nodes":39,
+      "fen":"rnb2k1r/pp1Pbppp/2p5/q7/2B5/8/PPPQNnPP/RNB1K2R w KQ - 3 9"
+   },
+   {
+      "depth":1,
+      "nodes":9,
+      "fen":"2r5/3pk3/8/2P5/8/2K5/8/8 w - - 5 4"
+   },
+   {
+      "depth":3,
+      "nodes":62379,
+      "fen":"rnbq1k1r/pp1Pbppp/2p5/8/2B5/8/PPP1NnPP/RNBQK2R w KQ - 1 8"
+   },
+   {
+      "depth":3,
+      "nodes":89890,
+      "fen":"r4rk1/1pp1qppp/p1np1n2/2b1p1B1/2B1P1b1/P1NP1N2/1PP1QPPP/R4RK1 w - - 0 10"
+   },
+   {
+      "depth":6,
+      "nodes":1134888,
+      "fen":"3k4/3p4/8/K1P4r/8/8/8/8 b - - 0 1"
+   },
+   {
+      "depth":6,
+      "nodes":1015133,
+      "fen":"8/8/4k3/8/2p5/8/B2P2K1/8 w - - 0 1"
+   },
+   {
+      "depth":6,
+      "nodes":1440467,
+      "fen":"8/8/1k6/2b5/2pP4/8/5K2/8 b - d3 0 1"
+   },
+   {
+      "depth":6,
+      "nodes":661072,
+      "fen":"5k2/8/8/8/8/8/8/4K2R w K - 0 1"
+   },
+   {
+      "depth":6,
+      "nodes":803711,
+      "fen":"3k4/8/8/8/8/8/8/R3K3 w Q - 0 1"
+   },
+   {
+      "depth":4,
+      "nodes":1274206,
+      "fen":"r3k2r/1b4bq/8/8/8/8/7B/R3K2R w KQkq - 0 1"
+   },
+   {
+      "depth":4,
+      "nodes":1720476,
+      "fen":"r3k2r/8/3Q4/8/8/5q2/8/R3K2R b KQkq - 0 1"
+   },
+   {
+      "depth":6,
+      "nodes":3821001,
+      "fen":"2K2r2/4P3/8/8/8/8/8/3k4 w - - 0 1"
+   },
+   {
+      "depth":5,
+      "nodes":1004658,
+      "fen":"8/8/1P2K3/8/2n5/1q6/8/5k2 b - - 0 1"
+   },
+   {
+      "depth":6,
+      "nodes":217342,
+      "fen":"4k3/1P6/8/8/8/8/K7/8 w - - 0 1"
+   },
+   {
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+      "nodes":92683,
+      "fen":"8/P1k5/K7/8/8/8/8/8 w - - 0 1"
+   },
+   {
+      "depth":6,
+      "nodes":2217,
+      "fen":"K1k5/8/P7/8/8/8/8/8 w - - 0 1"
+   },
+   {
+      "depth":7,
+      "nodes":567584,
+      "fen":"8/k1P5/8/1K6/8/8/8/8 w - - 0 1"
+   },
+   {
+      "depth":4,
+      "nodes":23527,
+      "fen":"8/8/2k5/5q2/5n2/8/5K2/8 b - - 0 1"
+   }
+]