See comments below...

... bE3 wE4 bE1 wF3!!!...

Normally wF2 is played in the corner. But with wF3 white has the
option to play aggresively with wF1 which usually is a bad idea
because the ko fight risk to much. But on a small board things are not

Can I ask which ruleset this is played with?

All the computer go engines here based on MCTS methods assumes area scoring rules. So unless stated otherwise you can see area scoring as default.

For example, in Japanese or similar rulesets where dame are not worth
anything, white cannot gain any benefit by starting the F1 ko. So I will
assume it's some sort of area counting until told otherwise...

Maybe F1 simply speaking is a trick move. Right now (on a new computer in office) I have to visualize the game in my head... so take any answers to your question with a grain of salt.

... bC1 wC5 bB5 wD6 bB6 wF1!...

white starts a ko. If white first plays wC6 bF1 wins the game right away.

To clarify, that would be B+1.5 (with your 2.5 komi) right?

This wF1 can be a skillful play to try to steal the last dame, but doesn't
your sequence below show it to be a failure (B+3.5)? I agree that bB4
(filling in your own territory) is optimal - nice move :)

Initially Valkyria (my program) and myself thought starting the ko was correct. But cutting as a first ko threat also creates a lot of kothreats. So of course it is a failure, but I am sure you could beat strong opponents with it. It is a good "trick" to try. But technically all moves for white are losing moves anyways since the komi is only 2.5. In other words it is a difficult move for both humans and at least one computer program.

After looking at the various games posted here and a number of variations
of my own, I'm inclined to think the correct komi is 4 (for area
Here is an interesting variation that noone has mentioned, maybe someone
can find a flaw:

bC3 wD4 bC4 wD3 bC2
wC5 bB5 wD5 bE2 wD2 bD1
wB6 bE3 wB4 bB3 wA5
bE4 wE5 bF5 wA3 bA2 wA4
bF4 wE6 bF6

I played it out with paper and pencil and it looks reasonable to me. But I need to check it later with Valkyria and Gogui.

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