# PJTraill

__PageType__: HomePage

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

I have some awareness of and interest in CGT.

## Unicode

Checking what is converted to hex in page source:

ίΏ‘£ ←→⇒ίΏ‘ 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 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.