# Tag Info

Accepted

### What's the longest possible forced repetition in Go?

Molasses ko: http://denisfeldmann.fr/bestiary3.htm#mol "The semeai in figure 11 is probably the worst known case of repetition. Known as "molasses ko", ..." Denis Feldmann's Go Bestiary is a ...
Accepted

### Why do asymmetric ko fights exist?

I think the easiest way to think of this is in terms of options, and the freedom to take whatever options benefit me. In your example, you have no options: You need to win this ko, or you will lose. ...
• 6,682
Accepted

### Is this a correct formal heuristic for invalid moves due to Ko?

No, this logic unfortunately doesn't work: It prevents moves that are in fact legal, because they include a snapback. \$\$ white to play \$\$ . . . . . . . \$\$ . . X O X . . \$\$ . X O X . X . \$\$ . X O O O ...
• 597
Accepted

### Does playing a ko add a dimension to the game?

"Ko" is effectively one of those situations where you can hope to get two moves in a row (e.g. if your opponent spends his next move filling, or otherwise removing the ko). On the other hand, if your ...
• 22.1k

### Is this double ko played reasonably by AlphaGo Zero and AlphaGo Lee?

There is a difference between the two semi-stable double ko positions, although a rather small one. C14 reduces the immediate number of liberties of the G13 leg. This means that black will have a free ...

### Does playing a ko add a dimension to the game?

I would say the added dimension comes from the "long-range" nature of kos. It is possible, through a ko, for two, otherwise loosely linked regions to be directly compared. Each ko evaluates the entire ...
• 121
Accepted

### How to apply the ko rule (Go)

The theoretical answer depends whose rules you are using, because different countries use different rules, and have different ways of dealing with the multi-ko1 situation you describe. In practice ...
• 1,438

### How to apply the ko rule (Go)

Super Ko can be detected efficiently using Zobrist hashing. https://en.wikipedia.org/wiki/Zobrist_hashing https://www.gnu.org/software/gnugo/gnugo_11.html#SEC144 The idea is to pick a random 64-bit ...
• 321