The above setup was used for all the games in round 3. This position is not quite as dangerous as the second setup, but definitely more dangerous than the first setup. The kingside is the center of the action in this setup, where the fenced-in kings, inactive rooks, and a-bishops play a critical role.
Almost certainly the most logical opening move is 1.b4, as this move prepares an attack against the enemy kingside. Both sides must evacuate their kings, usually to f2/f7, but sometimes to g2/g7. Unlike previous positions, it is not sufficient to move the king to the second rank. Often, he is still easily matable. On f2/f7 there are many setups involving checks on the diagonal, and on g2/g7, the king often gets epaulette mated down the g-file.
The best development for both sides seems to be to push the f and/or e-pawns. 1.b4 2.b5 e5 3.e4 f4 f5 looks extremely good for white. I think black's best try is probably 2.b5 f5, where white can respond with 3.d4 d5 e4. In either case, it seems white retains a slight pull, due to the creation of strong mate threats starting with his 5.
Play is almost entirely dictated by the avoidance of mate threats. Neither side typically does much developing, but instead shoves everything forward on the kingside to make a way out for the king. The rooks can play a surprisingly powerful role in this position if a file can be opened. The knights do not do much in this position other than to defend the weak g2/g7 square.
The queens are extremely powerful as well. If they are not removed early, they can be thrown like bowling balls into the enemy position, thus securing a material win. They must typically be removed in the 5-6 range.
In summation, most of the play in this position occurs on the kingside. Both sides typically move their b-pawns and their kingside pawns, and shove their king out diagonally. White appears to have an edge in this position.
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