rnbr4/1p1kb1p1/2pp3n/p3p1qp/PP1PP3/B1P2Q1P/5PP1/RN2KB1R w K - 1 15
FEN state: rnbr4/1p1kb1p1/2pp3n/p3p1qp/PP1PP3/B1P2Q1P/5PP1/RN2KB1R w K - 1 15 ; Best move: b4b5
The current state of the chess board is: Black rook at a8, black knight at b8, black bishop at c8 and black rook at d8. Black pawn at b7, black king at d7, black bishop at e7 and black pawn at g7. Black pawn at c6, black pawn at d6 and black knight at h6. Black pawn at a5, black pawn at e5, black queen at g5 and black pawn at h5. White pawn at a4, white pawn at b4, white pawn at d4 and white pawn at e4. White bishop at a3, white pawn at c3, white queen at f3 and white pawn at h3. White pawn at f2 and white pawn at g2. White rook at a1, white knight at b1, 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 1. Full move number is 15. White to move.