d4 gives e4 square. One of the most famous KIA games :
Note how white uses e4 square in this game to bring pieces to the attack.
I had an interesting KIA (a training game) where Black played ... d4:
Does anyone know why in kuzubov-grischuck 2017 rapid riyad black went for an early Bf8 and allowed Bg5, was it a mistake of move order?
d4 gives e4 square. One of the most famous KIA games :
Note how white uses e4 square in this game to bring pieces to the attack.