rq2kb1r/1p3ppp/n2p3n/p1p1p3/1PP1P1b1/P2P4/1B1NBPPP/RQ2K1NR w KQkq - 4 10
FEN state: rq2kb1r/1p3ppp/n2p3n/p1p1p3/1PP1P1b1/P2P4/1B1NBPPP/RQ2K1NR w KQkq - 4 10 ; Best move: b4b5
The current state of the chess board is: Black rook at a8, black queen at b8, black king at e8, black bishop at f8 and black rook at h8. Black pawn at b7, black pawn at f7, black pawn at g7 and black pawn at h7. Black knight at a6, black pawn at d6 and black knight at h6. Black pawn at a5, black pawn at c5 and black pawn at e5. White pawn at b4, white pawn at c4, white pawn at e4 and black bishop at g4. White pawn at a3 and white pawn at d3. White bishop at b2, white knight at d2, white bishop at e2, white pawn at f2, white pawn at g2 and white pawn at h2. White rook at a1, white queen at b1, white king at e1, white knight at g1 and white rook at h1. White kingside, white queenside, black kingside and black queenside castles are available. Half move number is 4. Full move number is 10. White to move.