Baltic chal. qual. final 17.07.

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Last hand in tournament

13 players left in game (possition 13) stack  app. 4400 blinds 300/600

7 players per table

Possition on tabe BU (KONKURENT21)

pocket hand As Ah

till my ection — all players folded

BU limp, SB fold, BB (stack app 11k) check

Flop Qh Ad 7c

BB bet 1200, BU call

Turn 10c

BB check, BU all in, BB request the time — call

showdown: BB Jc 8c, BU As Ah

River Kd

BB won with str8 A high

what i done wrong? should i push on flop?