r2k1br1/p3pp1p/n5p1/Rp2p3/1PPN1Bn1/1PP2P1b/6PP/1NQ1KB1R b - - 4 20
FEN state: r2k1br1/p3pp1p/n5p1/Rp2p3/1PPN1Bn1/1PP2P1b/6PP/1NQ1KB1R b - - 4 20 ; Best move: e5d4
The current state of the chess board is: Black rook at a8, black king at d8, black bishop at f8 and black rook at g8. Black pawn at a7, black pawn at e7, black pawn at f7 and black pawn at h7. Black knight at a6 and black pawn at g6. White rook at a5, black pawn at b5 and black pawn at e5. White pawn at b4, white pawn at c4, white knight at d4, white bishop at f4 and black knight at g4. White pawn at b3, white pawn at c3, white pawn at f3 and black bishop at h3. White pawn at g2 and white pawn at h2. White knight at b1, white queen at c1, white king at e1, white bishop at f1 and white rook at h1. Both players have exhausted their castles. Half move number is 4. Full move number is 20. Black to move.