r1b1kr2/1pp4p/B2p2pb/p3pp2/1P1B3P/4NP2/P1P2PP1/R2KQ2R w - - 4 20
FEN state: r1b1kr2/1pp4p/B2p2pb/p3pp2/1P1B3P/4NP2/P1P2PP1/R2KQ2R w - - 4 20 ; Best move: a6c4
The current state of the chess board is: Black rook at a8, black bishop at c8, black king at e8 and black rook at f8. Black pawn at b7, black pawn at c7 and black pawn at h7. White bishop at a6, black pawn at d6, black pawn at g6 and black bishop at h6. Black pawn at a5, black pawn at e5 and black pawn at f5. White pawn at b4, white bishop at d4 and white pawn at h4. White knight at e3 and white pawn at f3. White pawn at a2, white pawn at c2, white pawn at f2 and white pawn at g2. White rook at a1, white king at d1, white queen at e1 and white rook at h1. Both players have exhausted their castles. Half move number is 4. Full move number is 20. White to move.