Here I should probably play d5 right away

Now white controls d5, so..

Setting up the possibility of leaving black with the isolated d pawn, but I am gaining time since this pawn moved twice

I decide to give both sides isolated pawns in the center

A mistake. Or a pawn sac. No its a mistake.

Now I need to keep pieces and find an attack

Perhaps I can win the d-pawn back

Trying to weaken the white king position

White smartly pushes the weak pawn forward

Eying the weak light squares on the kingside