Board Solutions and Analyses

Here you'll find annotated solutions and analyses of Fathom It! boards found in both the evaluation and registered version. Reading through a solution can give you insight into solving Fathom It! boards or pitting your solution against the ones recorded here.

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## Index of Fathom It! Board Analyses

 Board Dimensions Board Difficulty Level 7 x 7 Easy Intermediate Hard Expert 10 x 10 Easy Intermediate Expert Incomplete row and column tallies

## 7x7 Intermediate Board Analyses

 Board Number Submitted by Comments 176 Shmuel Siegel Shmuel demonstrates a powerful technique of cross-checking row and column tallies within a sub-portion of the board. 2462 Shmuel Siegel Solves the board "four under par" (i.e., betters the automatic solver by four moves). A neat observation leads to the solution -- a triumph of mind over solver!

## 7x7 Hard Board Analyses

 Board Number Submitted by Comments 2 Moshe Rubin 4 Wei-Hwa Huang Elegant use of the "board uniqueness" assumption (over two columns, rather than one) to solve the board.To keep the record straight, here's Wei-Hwa's comment:... but it'd help if you pointed out that I solved the board again the "normal" way, lest I look like one to support the assumption. :)Found in both unregistered and registered versions.

## 10x10 Intermediate Board Analyses

 Board Number Submitted by Comments 2 Moshe Rubin Good step-by-step tutorial. Demonstrates placing the battleship by showing the other possible position leads to a contradiction.Found in both unregistered and registered versions.Here's a Turkish translation of this analysis. 10 Moshe Rubin Nice use of the "board uniqueness" technique.Found in both unregistered and registered versions.Here's a German translation of this analysis. 13 Moshe Rubin Found in registered version.

## 10x10 Hard Board Analyses

 Board Number Submitted by Comments 7 Shmuel Siegel Uses an original solving rule ( the "6x2 or 7x2 rectangle" rule) to break down the board. Found in both unregistered and registered versions. Shmuel Siegel Clever use of logic to place the battleship.  Once that's done, you should be able to solve the board relatively easily.Found in both unregistered and registered versions. 190 Shmuel Siegel After proving the battleship must reside in row C, there's only one valid position to place it at.  Everything else falls together from that point onwards. Found in registered version of Fathom It!.

## Incomplete Tallies: Board Analyses

 Submitted by Comments Shmuel Siegel From GAMES Magazine's "Brain Twisters from the World Puzzle Championships, Vol 2", pg.38.A fascinating insight unlocks this seemingly very difficult board. Moshe Rubin From GAMES Magazine's "Brain Twisters from the World Puzzle Championships, Vol 2", pg.39. Moshe Rubin From Thomas Snyder's "The Art of Puzzles" blog, Friday Puzzle #177, "24hour Battleships".A delightful incomplete tally Battleship puzzle, constructed to use the digits 2 and 4 as both row and column tallies.