PJTraill

PageType: HomePage    

I registered on 2018-01-28 when playing at about 7 kyu in [ext] Venlo, back from 5 kyu many years ago – must try to get back to that and further! Also on [ext] Josekipedia/Go problems & [ext] Board & Card Games Stack Exchange

I have some awareness of and interest in CGT.

Unicode

Checking what is converted to hex in page source:

 …ί–—Ώ‘£ “”‘’ ’ – —
 …←→⇒ί–—Ώ‘“”‘’ αβπ ± ≈
 § † ‡ ± Χ
 √⁰Ή²³⁴⁵⁶⁷⁸⁹⁺ⁿ⁽⁾  ₀₁₂₃₄₅₆₇₈₉₊₋₌₍₎ ∈ ≠ ≡ ⇐ ⇔ ⇒ π … ← → ↔ ↑↓ •◦‣∙
    sqrt ↑0..9+n() ↓etc.      elt neq implies pi ellipsis arrows bullets
 ≥ ≤ ≈
 ΠήȜ
 πώȝ“”‘’
 Ππ ήώ Ȝȝ

Greek ɑ

 ΑΒΓΔΕΖΗΘΙΚΛΜΝΞΟΠΡΣΤΥΦΧΨΩ
 αβγδεζηθικλμνξοπρςστυφχψω

ἁἑἡἱὁὑὡ

 £₯
 ί œ ζ ligatures
 “” ‘’ «» Ώ? ‘!
 –—
 ½ ⅓ Ό Ύ ⅐ ⅑ ⅒ ⅓ ⅔ ⅕ ⅖ ⅗ ⅘ ⅙ ⅚ ⅛ ⅜ ⅝ ⅞ ⅟
 ° degree
 ℕ Blackboard
 ⌊⌋⌈⌉ floor*2 ceil*2
   Smiley/grumpy (or vice versa)
 Ίͺ Masculine/feminine ordinal indicators
 ▲▼►◄ Black pointing triangles
    U+25CB ○ white circle (HTML ○)
    U+2686 ⚆ white circle with dot right (HTML ⚆)[94]
    U+2687 ⚇ white circle with two dots (HTML ⚇)
    U+25CF ● black circle (HTML ●)
    U+2688 ⚈ black circle with white dot right (HTML ⚈)
    U+2689 ⚉ black circle with two white dots (HTML ⚉)

Evidently it would not be a good idea to use Greek letters for diagram numbers beyond 9 or 10.

Eyes

Perhaps I want to weigh in at formal definitions of eye, but for now I shall make a few notes here:

Objectives:

  • A definition should make sense of large eye, false eye.
  • The definition should be static as far as possible, i.e. not depend on formulations like all possible sequences of moves.
  • It should be true that having two (true) eyes means that a group is alive — i.e. cannot be captured — in any rule-set!
    • The converse is less clear.
  • The definition should be independent of the board graph, depending only on which points are connected.

PJTraill last edited by PJTraill on May 15, 2018 - 11:29
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