r4bnr/p1k1p2p/np1q4/2p2pp1/PP2PN2/6PN/2PP1P1P/1RBQKBR1 w - - 0 13
FEN state: r4bnr/p1k1p2p/np1q4/2p2pp1/PP2PN2/6PN/2PP1P1P/1RBQKBR1 w - - 0 13 ; Best move: f4d5
The current state of the chess board is: Black rook at a8, black bishop at f8, black knight at g8 and black rook at h8. Black pawn at a7, black king at c7, black pawn at e7 and black pawn at h7. Black knight at a6, black pawn at b6 and black queen at d6. Black pawn at c5, black pawn at f5 and black pawn at g5. White pawn at a4, white pawn at b4, white pawn at e4 and white knight at f4. White pawn at g3 and white knight at h3. White pawn at c2, white pawn at d2, white pawn at f2 and white pawn at h2. White rook at b1, white bishop at c1, white queen at d1, white king at e1, white bishop at f1 and white rook at g1. Both players have exhausted their castles. Half move number is 0. Full move number is 13. White to move.