Extend insufficient material tests

Author: ianfab

src/apiutil.h

@@ -388,7 +388,7 @@ inline bool has_insufficient_material(Color c, const Position& pos) {
     }
 
     // Mating pieces
-    for (PieceType pt : { ROOK, QUEEN, ARCHBISHOP, CHANCELLOR, SILVER, GOLD, COMMONER, CENTAUR })
+    for (PieceType pt : { ROOK, QUEEN, ARCHBISHOP, CHANCELLOR, SILVER, GOLD, COMMONER, CENTAUR, AMAZON, BERS })
         if ((pos.pieces(c, pt) & ~restricted) || (pos.count(c, pos.promotion_pawn_type(c)) && (pos.promotion_piece_types(c) & pt)))
             return false;
 

test.py

@@ -174,6 +174,10 @@
     "newzealand": {
         "rnbqkbnr/pppppppp/8/8/8/8/PPPPPPPP/RNBQKBNR w KQkq - 0 1": (False, False),  # startpos
     },
+    "amazon": {
+        "rnbakbnr/pppppppp/8/8/8/8/PPPPPPPP/RNBAKBNR w KQkq - 0 1": (False, False),  # startpos
+        "8/8/8/8/A7/6k1/8/1K6 w - - 0 1": (False, True),  # KA vs K
+    },
     "seirawan": {
         "rnbqkbnr/pppppppp/8/8/8/8/PPPPPPPP/RNBQKBNR[HEhe] w KQBCDFGkqbcdfg - 0 1": (False, False),  # startpos
         "k7/8/8/8/8/8/8/K7[] w - - 0 1": (True, True),  # K vs K