Joaz Banbeck wrote:I favor having rules, and having penalties for breaking those rules, such that a player cannot profit by deliberately breaking them.
Often breaking the rules can have an up side for the player who does it. If the penalty does not have enough down side, then breaking the rules becomes profitable, and anarchy results. On the other hand, if the penalty has a lot more down side, then we will find players sometimes being penalized disproportionately for honest mistakes. So it is possible to err in either way when writing the rules.
A good rule should be just strong enough to prevent a player from profiting by breaking it. ( Measuring 'profit' includes not only the direct benefits on the board, but also the difficult to measure side effects such as disrupting your opponent's concentration. )
In the case of filling a ko, loss of the move seems sufficient.
While I agree with Joaz on there being some penalty, his suggestion is a slippery sufficiency.
As applied to double digit kyu games, and people new to tournaments, the rule applied in this case makes sense.
As applied to two very strong veterans like this, I am not so sure.
Joaz's suggestion would keep Mr. Silt the winner in this instance.
The AGA rule of a 3 pt penalty would make the game pretty close - 2 or 3 pts I think, but Mr. Silt would still be ahead.
The problem with the loss of move penalty is that it would often be game ending, the equivalent of forfeit for many kos in the middle of the game - the ko is lost with NO compensation. Clearly in many instances, this would lead to lost games for what Joaz calls "honest mistakes".
The stronger the player, the less comfortable I am with no penalty, the weaker the players, the more I agree.
The AGA rule is somewhat arbitrary, but at least it is something - not game ending in a middle game major ko, a stinging slap in a tight endgame ko and almost undetectable by a double digit kyu player.
I certainly prefer this to Joaz's suggestion - where the impact of the rule varies widely with the game position.
EDIT Ok, so I appear to be talking nonsense. I just checked the AGA rule, in fact it is Joaz's suggestion +. An Illegal move is removed and treated as a pass (both moves if you play twice in a row) which results in an additional one point penalty for a pass stone.