1rn1kb1r/1p4p1/1nq2p1p/pPppp2b/P7/2P1PPNP/R2P2K1/2BQ1B1R w k - 5 21
FEN state: 1rn1kb1r/1p4p1/1nq2p1p/pPppp2b/P7/2P1PPNP/R2P2K1/2BQ1B1R w k - 5 21 ; Best move: b5c6
The current state of the chess board is: Black rook at b8, black knight at c8, black king at e8, black bishop at f8 and black rook at h8. Black pawn at b7 and black pawn at g7. Black knight at b6, black queen at c6, black pawn at f6 and black pawn at h6. Black pawn at a5, white pawn at b5, black pawn at c5, black pawn at d5, black pawn at e5 and black bishop at h5. White pawn at a4. White pawn at c3, white pawn at e3, white pawn at f3, white knight at g3 and white pawn at h3. White rook at a2, white pawn at d2 and white king at g2. White bishop at c1, white queen at d1, white bishop at f1 and white rook at h1. Black kingside is the only castle move available. Half move number is 5. Full move number is 21. White to move.