Their dedication and mental stamina (maintaining focus over multiple long games) is a big factor. Their proficiency is like any game that you might practice to

Their dedication and mental stamina (maintaining focus over multiple long games) is a big factor. Their proficiency is like any game that you might practice to extreme: whether speed-cubing or competitive video games. Getting really good (fast), even for simple games like Tetris, Solitaire or Minesweeper is just training your brain to quickly recognise some very specific patterns.