Up through move 28, your game has looked solid. Despite your opponent playing some dubious moves, you are doing well, You have two safe groups, and he has weaknesses all over.

But leaving weaknesses seems contagious. Let's look at the recently played upper corner at move 28:

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[go]$$ Position at move 28
$$ ---------------------------------------
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . c . . . . . . . |
$$ | . . . . . . . . . . . . . a O O C . . |
$$ | . . . X . . X . . b . . . X X X O . . |
$$ | . . X . . . . . . . . . . . . . C . . |
$$ | . . O O . . . . . . . . . . . . O . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . O , . . . . . , . . . . . , . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . X . . . . |
$$ | . . . . . . . . . . . . . . . . X . . |
$$ | . . . . . . . . . . . . . . . . X X . |
$$ | . . . , X . . . . , . . . . X X O O . |
$$ | . . X . . . . . . . . . O . O O . O . |
$$ | . . . . . . . . . . . . . . . . O . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ ---------------------------------------[/go]

He has three heavy stones. He would like to secure them by playing 'a' and 'b'. But he doesn't have time. If he plays 'a', you play 'b' and he is in trouble. If he plays 'b' first, you undermine him with 'c'.
Unfortunately, your corner group has multiple cutting points ( marked with circles ).

This combination of vulnerable stones and weak spots on both sides makes a play here urgent. But you made a big gote move at G3. It is not urgent. What if he plays on the lower side first? Your lower right group is untouchable. Playing on the bottom is not urgent.

Remember the proverb "Urgent before big"?

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[go]$$ The urgent move
$$ ---------------------------------------
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . O O W . . |
$$ | . . . X . . X . . , . . . X X X O . . |
$$ | . . X . . . . . . . . . . . . . . . . |
$$ | . . O O . . . . . . . . . . . . O . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . O , . . . . . , . . . . . , . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . X . . . . |
$$ | . . . . . . . . . . . . . . . . X . . |
$$ | . . . . . . . . . . . . . . . . X X . |
$$ | . . . , X . . . . , . . . . X X O O . |
$$ | . . X . . . . . . . . . O . O O . O . |
$$ | . . . . . . . . . . . . . . . . O . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ ---------------------------------------[/go]

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