2bk1bnr/4n3/r2pq3/p1p2ppp/PP4B1/2N1P1P1/RBPP1P1P/4K2R w K - 0 21
FEN state: 2bk1bnr/4n3/r2pq3/p1p2ppp/PP4B1/2N1P1P1/RBPP1P1P/4K2R w K - 0 21 ; Best move: b4b5
The current state of the chess board is: Black bishop at c8, black king at d8, black bishop at f8, black knight at g8 and black rook at h8. Black knight at e7. Black rook at a6, black pawn at d6 and black queen at e6. Black pawn at a5, black pawn at c5, black pawn at f5, black pawn at g5 and black pawn at h5. White pawn at a4, white pawn at b4 and white bishop at g4. White knight at c3, white pawn at e3 and white pawn at g3. White rook at a2, white bishop at b2, white pawn at c2, white pawn at d2, white pawn at f2 and white pawn at h2. 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 21. White to move.