1nbqk1n1/rpp1b2r/4pp1p/1p1p2p1/P1PPP3/5NPP/1P2QP2/1RB1KB1R w K - 0 12
FEN state: 1nbqk1n1/rpp1b2r/4pp1p/1p1p2p1/P1PPP3/5NPP/1P2QP2/1RB1KB1R w K - 0 12 ; Best move: a4b5
The current state of the chess board is: Black knight at b8, black bishop at c8, black queen at d8, black king at e8 and black knight at g8. Black rook at a7, black pawn at b7, black pawn at c7, black bishop at e7 and black rook at h7. Black pawn at e6, black pawn at f6 and black pawn at h6. Black pawn at b5, black pawn at d5 and black pawn at g5. White pawn at a4, white pawn at c4, white pawn at d4 and white pawn at e4. White knight at f3, white pawn at g3 and white pawn at h3. White pawn at b2, white queen at e2 and white pawn at f2. White rook at b1, white bishop at c1, white king at e1, white bishop at f1 and white rook at h1. White kingside is the only castle move available. Half move number is 0. Full move number is 12. White to move.