From c34b4c1b036058b2906556850cc4ded6ececcf89 Mon Sep 17 00:00:00 2001
From: Aargh Rai <aargh.rai+git@gmail.com>
Date: Thu, 16 Jul 2026 23:03:28 +0530
Subject: fixed pawn gen, onto the next perf

---
 src/engine/moves.c | 75 ++++++++++++++++++++++++++----------------------------
 1 file changed, 36 insertions(+), 39 deletions(-)

(limited to 'src/engine/moves.c')

diff --git a/src/engine/moves.c b/src/engine/moves.c
index 3aff11e..0c923a1 100644
--- a/src/engine/moves.c
+++ b/src/engine/moves.c
@@ -221,14 +221,17 @@ void perft_divide(position_t position, int depth) {
   moves_t moves;
   moves_init(&moves);
   get_legal_moves(&moves, position);
+  int nodes = 0;
   for (int i = 0; i < moves.length; i++) {
     position_t copy = position;
     position_make_move(&copy, moves.moves[i]);
     int c = count_positions(copy, depth - 1);
+    nodes += c;
     printf("  %c%d%c%d: %d\n",
       'a' + (moves.moves[i].from % 8), 1 + (moves.moves[i].from / 8),
       'a' + (moves.moves[i].to % 8), 1 + (moves.moves[i].to / 8), c);
   }
+  printf("\nNodes: %d\n", nodes);
   moves_deinit(moves);
 }
 
@@ -238,19 +241,17 @@ bool test_perft_starting_position() {
     "rnbqkbnr/pppppppp/8/8/8/8/PPPPPPPP/RNBQKBNR w KQkq - 0 1"
   ).position;
   int d;
-  d = count_positions(position, 0); printf("d0: %d\n", d); if (d != 1) return false;
-  d = count_positions(position, 1); printf("d1: %d\n", d); if (d != 20) return false;
-  d = count_positions(position, 2); printf("d2: %d\n", d); if (d != 400) return false;
-  d = count_positions(position, 3); printf("d3: %d\n", d); if (d != 8902) return false;
-  d = count_positions(position, 4); printf("d4: %d\n", d); if (d != 197281) return false;
+  d = count_positions(position, 0); if (d != 1) return false;
+  d = count_positions(position, 1); if (d != 20) return false;
+  d = count_positions(position, 2); if (d != 400) return false;
+  d = count_positions(position, 3); if (d != 8902) return false;
+  d = count_positions(position, 4); if (d != 197281) return false;
 
   position_t castle_pos = load_fen(
     "r3k2r/8/8/8/8/8/8/R3K2R w KQkq - 0 1"
   ).position;
-  int cp = count_positions(castle_pos, 1);
-  printf("R3K2R d1: %d (expected 26)\n", cp);
-
-  d = count_positions(position, 5); printf("d5: %d\n", d); if (d != 4865609) return false;
+  d = count_positions(castle_pos, 1); if (d != 26) return false;
+  d = count_positions(position, 5); if (d != 4865609) return false;
   return true;
 }
 
@@ -259,37 +260,33 @@ bool test_perft_kiwipete_position() {
     "r3k2r/p1ppqpb1/bn2pnp1/3PN3/1p2P3/2N2Q1p/PPPBBPPP/R3K2R w KQkq - 0 1"
   ).position;
   int d;
-  d = count_positions(position, 1); printf("d1: %d (expected 48)\n", d); if (d != 48) return false;
-  printf("--- Kiwipete d2 divide ---\n"); perft_divide(position, 2);
-  d = count_positions(position, 2); printf("d2: %d (expected 2039)\n", d); if (d != 2039) return false;
+  d = count_positions(position, 1); if (d != 48) return false;
+  d = count_positions(position, 2); if (d != 2039) return false;
+  d = count_positions(position, 3); if (d != 97862) return false;
+  d = count_positions(position, 4); if (d != 4085603) return false;
 
-  printf("\n--- Debug: investigate e5g6 ---\n");
-  {
-    moves_t moves;
-    moves_init(&moves);
-    get_legal_moves(&moves, position);
-    for (int i = 0; i < moves.length; i++) {
-      if (moves.moves[i].from == 36 && moves.moves[i].to == 46) {
-        position_t copy = position;
-        position_make_move(&copy, moves.moves[i]);
-        printf("After Nxe5g6, turn=%d, is e8 attacked by white? %d\n",
-          copy.turn, square_attacked(copy, 60, WHITE_TURN));
-        moves_t black_moves;
-        moves_init(&black_moves);
-        get_legal_moves(&black_moves, copy);
-        printf("Black has %d legal moves:\n", black_moves.length);
-        for (int j = 0; j < black_moves.length; j++) {
-          printf("  %c%d%c%d flags=%d\n",
-            'a' + (black_moves.moves[j].from % 8), 1 + (black_moves.moves[j].from / 8),
-            'a' + (black_moves.moves[j].to % 8), 1 + (black_moves.moves[j].to / 8),
-            black_moves.moves[j].flags);
-        }
-        moves_deinit(black_moves);
-        break;
-      }
-    }
-    moves_deinit(moves);
-  }
+  // my move gen too slow to verify this
+  // d = count_positions(position, 5); if (d != 193690690) return false;
+
+  return true;
+}
+
+bool test_perft_position3() {
+  position_t position = load_fen(
+    "8/2p5/3p4/KP5r/1R3p1k/8/4P1P1/8 w - - 0 1"
+  ).position;
+  int d;
+  d = count_positions(position, 1); if (d != 14) return false;
+  d = count_positions(position, 2); if (d != 191) return false;
+  d = count_positions(position, 3); if (d != 2812) return false;
+  d = count_positions(position, 4); if (d != 43238) return false;
+  d = count_positions(position, 5); if (d != 674624) return false;
+  perft_divide(position, 6);
+  d = count_positions(position, 6);
+  printf("%d\n", d);
+  if (d != 11030083) return false;
+  d = count_positions(position, 7); if (d != 178633661) return false;
+  d = count_positions(position, 8); if (d != 3009794393) return false;
 
   return true;
 }
-- 
cgit v1.2.3