Play Kikashi Before Defending
To "play kikashi before defending" is an idea, derived from choshi, where if you must defend in an area in order to live, make good shape, or remove aji, it is usually correct to play kikashi in the area before doing so.
The idea of kikashi before defending is to play kikashi that are:
- Not required for defence
- Threaten to make defending unnecessary
- May not be answered if played later (after defending).
- Give a local gain if answered.
All of the above points are usually more desirable than simply living or playing in gote. The reason it is not always correct is because kikashi moves can destroy aji as well as create it. See kikashi for more ideas about the term itself
(from Shape Problem 1)
Forcing with and (in that order) before capturing with follows the proverb. leaves behind ladder aji, practically forcing White to capture at to fix up his shape, allowing Black to end in sente. (There is still aji - is still not captured yet!)
Failing to play kikashi first gives White too many options, even allowing him to follow the proverb himself to make good shape, for instance at and here. If the left side is not important now or later, White may ignore a later peep at a.
White (Takemiya) forces first with and before returning to live at - these two stones are useful moves that contribute to finishing off Takemiya's moyo on the lower side.
Dieter: Why did Black allow for a second forcing move with ? Couldn't he play at ?
unkx80: Probably to apply pressure on the stone.
elfking: if 2 was played at 4 then white can play at 5, which becomes somewhat sente because afterwards if black plays tenuki the moyo formed by white playing at 2 or at a is quite big as far as I can see.
In a game vs. Yamashita Keigo in the 29th Meijin league, Cho Chikun plays kikashi with - before strengthening his center group with . (See commentary at http://www.asahi.com/igo/meijin29/16/05.html.) As it turns out here, despite the proverb about sacrificing kikashi stones, only happens to be in any danger!
- Xuanxuan Qijing Problem 169/Solution