貝かい覆おおい

• 貝覆い
  • かいおおい

    Standard kanji spelling with full okurigana.

  • かいおい

    out-dated reading
• 貝かいおおい

  Mixed kanji-kana spelling; the okurigana portion is written in hiragana.

• 貝覆
  irregular okurigana
  • かいおおい

    Irregular okurigana usage; the reading かいおい is also possible but obsolete.

  • かいおい

    out-dated reading
• かいおい
  out-dated reading

Compound of 貝 (kai, 'shell') and 覆い (ōi, 'covering'), referring to the act of covering or matching shells in the game.