rnbq2n1/4p1br/2pk3p/pp1p1pp1/PP1P2P1/3KP2N/2P1QP1P/RNB2B1R w - - 4 13
FEN state: rnbq2n1/4p1br/2pk3p/pp1p1pp1/PP1P2P1/3KP2N/2P1QP1P/RNB2B1R w - - 4 13 ; Best move: a4b5
The current state of the chess board is: Black rook at a8, black knight at b8, black bishop at c8, black queen at d8 and black knight at g8. Black pawn at e7, black bishop at g7 and black rook at h7. Black pawn at c6, black king at d6 and black pawn at h6. Black pawn at a5, black pawn at b5, black pawn at d5, black pawn at f5 and black pawn at g5. White pawn at a4, white pawn at b4, white pawn at d4 and white pawn at g4. White king at d3, white pawn at e3 and white knight at h3. White pawn at c2, white queen at e2, white pawn at f2 and white pawn at h2. White rook at a1, white knight at b1, white bishop at c1, white bishop at f1 and white rook at h1. Both players have exhausted their castles. Half move number is 4. Full move number is 13. White to move.