Monotone Boards in PLO: 5.2% of Flops, None of the Usual Rules
Monotone flops are rare (5.2% of all flops) and they invert the normal logic of made hands. A completely random PLO hand has already flopped a flush on one 18.0% of the time. In the standard button-vs-big-blind single-raised pot on K-7-2 all hearts, the button's arriving range holds a flush 21.4% of the time (7.4% the nut flush) and the big blind's 21.3% - roughly one player in a heads-up pot has a flush on the flop, before anyone bets.
The numbers are exact class shares from the range advantage ranges and the board probabilities reference; the c-bet figures below come from aggregating all 1,755 flops of the 6-max 100bb solve.
What "made hand" means here
With a fifth of each range already flushing, the ladder compresses: sets stop being stack-off hands (they are drawing to fill up against a fifth of the opponent's range), two pair is a bluff-catcher, and the real currency splits into flush-versus-flush. Only about a third of those flushes are the nut flush, so most flopped flushes here are someone's second-best hand waiting to happen, and flush-over-flush is where monotone stacks actually move. The texture's signature bluff card is the bare ace of the suit - a specific card held by 7.7% of hands that removes the nut flush from the opponent's range entirely. Single blockers normally move equity a point or two; the nut-flush blocker on a monotone board is the exception that earns its bluffs.
How the solve plays it
Monotone boards get c-bet 40.9% as a class, the lowest of the three suit classes and eleven points under the 52.3% overall average - the fifteen least-bet flops in the whole solve are all monotone. The composition changes too: the bets skew small and the checks are not surrender. On K-7-2 monotone specifically, the button bets 36.6% and almost all of it is the 33% size (33.9 of those 36.6 points) - and the big blind donk-leads it 14.5%, above its own 13.5% average, because a capped-feeling board where either player can already have a flush is exactly where the out-of-position range stops respecting the opener. Monotone is the leading texture across the board: 18.3% as a class, against 14.4% rainbow, 12.4% two-tone, and 3.5% on ace-high boards, and the heaviest leads within the class land on middling monotone flops - T-6-3 monotone gets led 27.6% of the time.
The turn is where monotone pots resolve. A fourth suit card comes 20.4% of the time and shrinks every one-card flush to a chop-or-lose; a pairing card frees the sets. The board probabilities page has the full runout tree - the number worth memorizing is that a board finishing five-flush happens just 3.8% of the time from a monotone flop, so the "board plays the flush" bailout almost never arrives.
Play a few monotone boards against real ranges on the range advantage page (K-7-2 monotone is one of its twelve curated textures), and check your own range's flush share in the hand distribution tool.