Ruy Lopez, exchange - Bronstein variaton
Some general ideas for white after 6. Na3 might be to fight for some light squares with 7. Qe2 with a continuing eye to exchange the LSB or at least make it passive. Also getting black to advance qside pawns early hinders safe ...0-0-0 easing white kside worries. Exchanging pieces probably benefits white in general.
Here white did well to get the passer but might not have had minor pieces placed very well for support. Time lost probably gave black time to counter strongly on kside without any worries for own king.
At 16...h6 black looks fine and white seems a bit bound. From there black manages to increase kside pressure with little counterplay from white. From 10. Nc2 to 24. Bf4 there seemed a number of N & B moves that didn't do a lot.
Even so there might have been some saving continuations but the passive position and tempo loss makes very precise play necessary and that's never easy.
white made lots of mistakes. his whole na6 c3 d4 nc2 plan looked fishy to me and later he made tactical blunders
T4 Analysis: d14 Hou1.5
WHITE:
- T1: 53.7%
- T2: 65.9%
- T3: 73.2%
- T4: 82.9%
BLACK
- T1: 70.7%
- T2: 82.9%
- T3: 97.9%
- T4: 100.0%
Not sure if that's applying something, or what the OP's interest in the posted game is. White made plenty of positional mistakes. The idea of Na3 is to play nc4, so after be6 Qe2 is a more testing move. White can play d4 without preparing it with c3, unless black plays c5. In the opposite castled position, white started making pawn moves in front of king for some reason.