diff -r 970748b9a73b -r 7ffd66591afe src/rules/pawn.c
--- a/src/rules/pawn.c	Wed Mar 26 14:53:15 2014 +0100
+++ b/src/rules/pawn.c	Fri Mar 28 11:45:01 2014 +0100
@@ -35,8 +35,9 @@
         if (move->fromrow == move->torow + d && (
             move->fromfile == move->tofile + 1 ||
             move->fromfile == move->tofile - 1)) {
-            // TODO: en passant
-            return mdst(board,move) != 0; /* color has been checked */
+
+            return mdst(board,move)
+                || (board[move->fromrow][move->tofile] & ENPASSANT_THREAT);
         } else {
             return FALSE;
         }