Logic Masters Deutschland e.V.

This puzzle was part of a team round "Table for Four" from the recent puzzle weekend.

A similar team round appeared first at this years WPC. In this round, teams of four players had to solve puzzles in four colours; each player had a coloured pen (red, green, blue, black) and wasn't allowed to write in a different colour. Each puzzle has grid size 9x9, and in each colour 20 cells have to be marked; one cell remains empty. No cell can be marked in more than one colour.

By comparison the rules at the puzzle weekend have been changed slightly: Instead of coloured pens, the players were given coloured chips (20 red, yellow, green and blue) which had to be placed on the puzzle grid. Each player was allowed to place only chips of his own colour; no other items were permitted. If you would like to solve the puzzles in this way, here is a PDF with puzzle grids in proper size.

The clues outside the grid apply only for the player with the corresponding colour; the players are seated at four sides of a table, and clues are always orientated towards the player with the corresponding colour.

The rules for each player are:

Place two snakes of length 10 in the grid, where a snake consists of orthogonally connected cells. The two snakes cannot touch either themselves or each other, not even diagonally. Clues outside the grid represent the number of snake segments in the corresponding columns and rows respectively. The heads and tails of both snakes will be marked by circles in the grid.