# UP STAR

Keywords: EndGame, Theory

In Combinatorial Game Theory UP STAR, written “↑*” or “"↑"ast”[1], is equal to the sum of the infinitesimals UP (uarr) and STAR (ast). It is fuzzy, which means that the first player wins.

In chilled go, where each move costs one point, this position is an UP STAR.

UP STAR in chilled go

For a discussion of a position like this one, see More Infinitesimals.

## Coding UP STAR

When coding UP STAR while editing an article it may be written:

• In plain text, using an HTML entity for UP and a normal asterisk for STAR: “&uarr;*”, yielding “↑*”; this raises the star unwantedly, which is not quite consistent with printed CGT texts, but not too bad.
• In MathJax, using the codes “uarr” and “ast”:
• It is preferable to use a literal (with an HTML entity) for UP (but not for STAR): “ "&uarr;"ast ”, yielding “"↑"ast”.
• Enclose in invisible brackets if part of a larger formula: “ uarr - ast = uarr + ast = {:"&uarr;"ast:} ”, yielding “ uarr - ast = uarr + ast = {:"↑"ast:} ”.
• The simpler code “ uarr ast ”, yields “ color(DarkRed)(uarr ast) ”, which unfortunately contains a confusing extra space.