1rbqkbnr/p2nppp1/3p3p/2pP4/PPp3P1/R6N/4PP1P/1NBQKBR1 w k - 0 10
FEN state: 1rbqkbnr/p2nppp1/3p3p/2pP4/PPp3P1/R6N/4PP1P/1NBQKBR1 w k - 0 10 ; Best move: b4b5
The current state of the chess board is: Black rook at b8, black bishop at c8, black queen at d8, black king at e8, black bishop at f8, black knight at g8 and black rook at h8. Black pawn at a7, black knight at d7, black pawn at e7, black pawn at f7 and black pawn at g7. Black pawn at d6 and black pawn at h6. Black pawn at c5 and white pawn at d5. White pawn at a4, white pawn at b4, black pawn at c4 and white pawn at g4. White rook at a3 and white knight at h3. White pawn at e2, white pawn at f2 and white pawn at h2. White knight at b1, white bishop at c1, white queen at d1, white king at e1, white bishop at f1 and white rook at g1. Black kingside is the only castle move available. Half move number is 0. Full move number is 10. White to move.