Rules:
Here is a Gomoku endgame after move 38, with the black and white circles representing the stones. You will play as Black ● and have to form an Open Four — four consecutive stones of the same color with both ends open — on move 43 to secure a win. White ○ always plays optimally.
After that:
Normal Sudoku rules apply: each row, column, and 3×3 box contains the digits 1-9 exactly once. Additionally:
·Odd:
Black circles ● contain odd digits.
·Counting Circles:
Each digit in a white circle ○ indicates the number of times that digit occurs among all white circles.
·Anti-V:
No two orthogonally adjacent cells may contain digits that sum to 5.
·The last Black stone ● played on move 43 is 9, and the White stone ○ closest to it is digit 1.
Here you can solve the puzzle online:
Solve on SudokuPad
The difficulty is probably 4 stars. I wish you joyful solving!
Hint:
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What happens if the Counting Circles contain all four even digits?
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In which rows can the 2s in Counting Circles be placed?
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