1nbk1bnr/1p1q3p/r1p1pp2/p5p1/PPp1NP2/4PBPQ/R2PN2P/2B1K2R w K - 0 18
FEN state: 1nbk1bnr/1p1q3p/r1p1pp2/p5p1/PPp1NP2/4PBPQ/R2PN2P/2B1K2R w K - 0 18 ; Best move: b4b5
The current state of the chess board is: Black knight at b8, black bishop at c8, black king at d8, black bishop at f8, black knight at g8 and black rook at h8. Black pawn at b7, black queen at d7 and black pawn at h7. Black rook at a6, black pawn at c6, black pawn at e6 and black pawn at f6. Black pawn at a5 and black pawn at g5. White pawn at a4, white pawn at b4, black pawn at c4, white knight at e4 and white pawn at f4. White pawn at e3, white bishop at f3, white pawn at g3 and white queen at h3. White rook at a2, white pawn at d2, white knight at e2 and white pawn at h2. White bishop at c1, white king at e1 and white rook at h1. White kingside is the only castle move available. Half move number is 0. Full move number is 18. White to move.