18G Row Single Run demo

A four-by-four board is chosen uniformly from legal placements of the selected 3, 4 or 5 mines. Within each row, mines form at most one contiguous block; an empty row is allowed. The board remains fixed during the round.

After safe reveals, gross quote = 0.96 × captured stake × initial legal-board count / remaining compatible-board count. Each safe reveal keeps only boards where that cell is safe. The captured stake is fixed at start and does not grow as cells are revealed. A mine ends the round with zero return.

Cells that are certainly mines are disabled. A cell is also disabled if its safe outcome would quote more than 1,000 times the stake. When no eligible reveal remains, the current quote is collected automatically. Manual collection becomes available after the first safe reveal.

The legal support sizes are 408, 986 and 1,704 for 3, 4 and 5 mines. At a current support of C boards, an eligible cell safe in S boards has conditional safe probability S/C. Its safe quote changes by C/S. Including the mine outcome, this preserves exact 96% expected gross return; it does not guarantee a session balance or a profitable collection.

The initial demo balance is 1,000 coins. Starting subtracts the captured stake. Settlement adds the gross return, retaining fractional remainders for later settlements. When idle with a balance below 10, the restore button sets the balance to 1,000; it does not add 1,000.

This is an independently authored browser demo and information guide. Its calculations do not verify an outside business, licence, app or payment service associated with the 18G search term. Reloading ends an unfinished round without refund; settled balance and fractional carry remain stored in this browser.