GlossaryAt the table

Two-tone board

A flop with exactly two cards of one suit, so a flush draw is possible but no flush yet.

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What it means
Two of the three flop cards share a suit and the third is a different suit. Any hand with two cards of the shared suit has a flush draw.
How it is calculated
Count the suits on the flop: two suits means two-tone, one suit means monotone, three suits means rainbow.
Worked example
K♠9♠5♦ is two-tone: A♠Q♠ has the nut flush draw with 9 spades left.
Why it matters
Flush draws give the defending range more hands that continue, so the bettor bets less often or larger than on a rainbow flop.

See also: Board texture, Rainbow board, Monotone board