Count only quiet moves for move count pruning.

compare.sh

@@ -2,16 +2,20 @@
 
 set -e
 
+hash='4'
 tc='3+0.03'
 base='main'
 for arg in "$@"; do
     case "$arg" in
-        tc=*)
-            tc="${arg#tc=}"
-            ;;
-        base=*)
-            base="${arg#base=}"
-            ;;
+    hash=*)
+        hash="${arg#hash=}"
+        ;;
+    tc=*)
+        tc="${arg#tc=}"
+        ;;
+    base=*)
+        base="${arg#base=}"
+        ;;
     esac
 done
 
@@ -21,7 +25,7 @@ branch=$(git branch --show-current)
 c-chess-cli \
     -engine cmd="./branches/seawall-${branch}" \
     -engine cmd="./branches/seawall-${base}" \
-    -each option.Hash=256 tc="$tc" \
+    -each option.Hash="$hash" tc="$tc" \
     -openings file=./books/testing.fen order=random \
     -games 20000 -repeat \
     -concurrency 2 -log -sprt

sample.sh

@@ -7,7 +7,7 @@ branch=$(git branch --show-current)
 c-chess-cli \
     -engine cmd="./branches/seawall-${branch}" \
     -engine cmd="./branches/seawall-main" \
-    -each option.Hash=16 tc=1+0.01 \
+    -each option.Hash=4 tc=1+0.01 \
     -openings file=./books/training.fen order=random \
     -games 500 -concurrency 2 \
     -sample freq=0.24 decay=0.005 resolve=y file="samples/$(date '+%Y%m%d-%H%M%S').csv" format=csv

seawall.cc

@@ -1420,14 +1420,19 @@ std::pair<int, Move> Search::search(bool pv, int ply, int depth, int alpha, int
     int orig_alpha = alpha;
 
     int move_count = 0;
+    int mcp = 0;
 
     while (Move mv = gen.next())
     {
         if (!checkers && move_count && depth <= 5 && eval < alpha - (depth * 240 - 140) && !(type(mv) & (CAPTURE | PROMOTION)))
             continue;
-        if (!checkers && depth <= 5 && alpha > -SCORE_WIN && move_count > 5 + 5 * depth && eval < alpha - 50 * depth &&
+        if (!checkers && depth <= 5 && alpha > -SCORE_WIN && eval < alpha - 25 - 25 * depth &&
                 !(type(mv) & (CAPTURE | PROMOTION)) && mv != prev_best && mv != stack[ply].killer_moves[0] && mv != stack[ply].killer_moves[1])
-            break;
+        {
+            ++mcp;
+            if (mcp > 4 * (depth - 1) + 2)
+                break;
+        }
 
         int extension = 0;
         if (checkers)