for those who are not satisfied with "Drop Chess" ... Swapco is a short name for swap column ... easy electronic version, though it can also be played face to face ...it requires some dose of visual skills (well, we play chess so what's the problem, right ?) and can be very, very tricky ... rules below:

1. All the traditional rules apply with a twist ...

2. At any time after the 5th move each player has a right to swap any column with any other one ... within the same class ... odd numbered columns can be swapped only with odd numbered columns and the same rule applies to even numbered columns ...

3. Players CANNOT swap back the same columns to their original position in their next move ... it's possible later on ...

4. Swapping columns is considered as a complete move (player either makes regular move or swaps) ...

5. Swap can only be performed ONCE by each player ...

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I enjoy inventing new variants, so please forgive me, lol.

Andy.