4k1nr/prp2ppN/1pn1p3/2b1B2P/1P2b2P/5P2/P2PP1BK/RN1Q3R w k - 3 20
FEN state: 4k1nr/prp2ppN/1pn1p3/2b1B2P/1P2b2P/5P2/P2PP1BK/RN1Q3R w k - 3 20 ; Best move: b4c5
The current state of the chess board is: Black king at e8, black knight at g8 and black rook at h8. Black pawn at a7, black rook at b7, black pawn at c7, black pawn at f7, black pawn at g7 and white knight at h7. Black pawn at b6, black knight at c6 and black pawn at e6. Black bishop at c5, white bishop at e5 and white pawn at h5. White pawn at b4, black bishop at e4 and white pawn at h4. White pawn at f3. White pawn at a2, white pawn at d2, white pawn at e2, white bishop at g2 and white king at h2. White rook at a1, white knight at b1, white queen at d1 and white rook at h1. Black kingside is the only castle move available. Half move number is 3. Full move number is 20. White to move.