Some Zendo Rules
| Rating | A Koan has the Buddha-nature if and only if … |
| 1 | it has a red piece and a blue piece |
| 1 | it has a red piece pointing at a red piece |
| 1 | it has an ungrounded yellow medium |
| 1 | it has at least two yellow pieces |
| 1 | it has exactly one yellow flat piece |
| 1 | it has exactly two red pieces |
| 2 | all of the upright pieces are grounded, and there exists an upright piece |
| 2 | it has a yellow or a green piece |
| 2 | it has an equal number of red and blue pieces |
| 2 | it has an ungrounded weird piece |
| 2 | it has at least one weird piece |
| 2 | it has exactly one upright piece |
| 2 | it has is at least one color with two or more pieces |
| 2 | it has no medium pieces |
| 2 | it has no more than one piece of each color |
| 2 | it has no upright pieces |
| 3 | all flat pieces point at upright pieces, and there exists at least one flat piece |
| 3 | all of the flat pieces point at upright pieces |
| 3 | all of the red pieces are upright, and there exists at least one red piece |
| 3 | all the pieces are flat, ignoring red pieces |
| 3 | all the small pieces are red, all the medium pieces are green, and all the large pieces are blue |
| 3 | all the upright pieces are the same size |
| 3 | all weird pieces are ungrounded, and there exists at least one weird piece |
| 3 | exactly half of the pips are from large pieces |
| 3 | it has a blue piece or a weird piece |
| 3 | it has a blue piece pointing at a flat piece |
| 3 | it has a flat large piece and an upright small piece |
| 3 | it has a flat pointed at a non-flat |
| 3 | it has a grounded green piece or ungrounded yellow piece |
| 3 | it has a grounded weird piece |
| 3 | it has a medium upright piece between two other upright pieces, all in a stack |
| 3 | it has a non-upright red piece |
| 3 | it has a piece pointed at a smaller piece |
| 3 | it has a piece that is pointing at, but not touching, a red piece |
| 3 | it has a piece touching a piece of its own size |
| 3 | it has a piece which points at a piece of a different color |
| 3 | it has a red piece pointing at a large piece |
| 3 | it has a small yellow upright on top of a medium red upright, and nothing else |
| 3 | it has a three-piece tower that contains a red piece |
| 3 | it has a weird blue piece |
| 3 | it has an even number of colors represented |
| 3 | it has an odd number of medium pieces |
| 3 | it has an ungrounded blue piece pointing at a weird piece |
| 3 | it has an ungrounded flat piece |
| 3 | it has an ungrounded large, and no other large pieces |
| 3 | it has an upright green piece |
| 3 | it has an upright piece touching a flat piece |
| 3 | it has an upright tower where the top piece is larger than all the other pieces in the tower |
| 3 | it has at least one flat and no weirds |
| 3 | it has at least one piece of every size |
| 3 | it has at least two colors with two or more pieces |
| 3 | it has at least two pieces of the same color |
| 3 | it has exactly one piece of every size |
| 3 | it has exactly one ungrounded large, and no other larges |
| 3 | it has exactly three non-yellow pieces |
| 3 | it has exactly three pieces, none of which are blue |
| 3 | it has exactly three towers |
| 3 | it has exactly two non-large pieces |
| 3 | it has more blue pieces than any other color, considered individually |
| 3 | it has more medium pieces than large pieces |
| 3 | it has more small pieces than large pieces |
| 3 | it has no blue pieces and no small pieces |
| 3 | it has no green pieces pointing at something |
| 3 | it has no medium upright pieces |
| 3 | it has no pieces pointing at any other piece |
| 3 | it has no pieces that both point at, and touch, another single piece |
| 3 | it has no red flat pieces |
| 3 | it has two non-red pieces |
| 3 | it has two pieces of the same size, and two pieces of the same color |
| 3 | no large pieces point at red pieces (…equal to black if a large points at a red…) |
| 3 | none of the medium pieces are red |
| 3 | the majority of the pieces are green |
| 3 | the number of yellow pieces equals the number of green pieces |
| 3 | the total pip count is a multiple of 3 |
| 3 | the total pip count is less than or equal to 4 |
| 3 | the total red pip count is even and non-zero |
| 4 | a medium piece touches a flat piece |
| 4 | a piece points at exactly two other pieces |
| 4 | a red piece points at a large piece |
| 4 | a red piece points at a weird piece |
| 4 | a red piece touches a weird piece |
| 4 | all flat pieces point at upright pieces |
| 4 | all of the flat pieces are small, and there exists at least one flat piece |
| 4 | all of the green pieces are upright, or there are no green pieces |
| 4 | all of the weird pieces are medium, and there exists at least one medium piece |
| 4 | every piece in the koan touches exactly one other piece, which is of a different color |
| 4 | exactly half of the pieces are medium |
| 4 | exactly half of the pieces are upright |
| 4 | exactly half of the pip count comes from green |
| 4 | exactly one-third of the pieces are yellow |
| 4 | it has a blue piece pointing at something and a red piece being pointed at |
| 4 | it has a blue piece which points at, but does not touch, a small piec |
| 4 | it has a flat piece and no yellow pieces |
| 4 | it has a green piece, or both a red piece and a blue piece |
| 4 | it has a large piece and a different piece which is upright |
| 4 | it has a medium ungrounded piece or a blue piece |
| 4 | it has a non-blue medium piece or a blue piece |
| 4 | it has a piece pointing at a single blue piece and not pointing at any other pieces |
| 4 | it has a piece touching a piece of its own orientation |
| 4 | it has a piece which points at a piece of a different size |
| 4 | it has a red or green piece pointing at another piece |
| 4 | it has a small piece touching a medium piece |
| 4 | it has a small piece touching a weird piece |
| 4 | it has a small red and an ungrounded weird piece |
| 4 | it has a weird piece but no flat pieces |
| 4 | it has a weird piece touching a blue piece |
| 4 | it has a yellow touching a non-yellow |
| 4 | it has an equal number of red and green pips |
| 4 | it has an ungrounded large touching a small |
| 4 | it has an upright piece pointing at something |
| 4 | it has an upright piece with its pip-count number of pieces pointing at it |
| 4 | it has at least one piece which points at no other pieces (…equal to black if all pieces point at something…) |
| 4 | it has at least two blue pieces or at least two small pieces |
| 4 | it has exactly 4 pips of weird |
| 4 | it has exactly eight pips |
| 4 | it has exactly two orientations represented |
| 4 | it has five grounded pips |
| 4 | it has no pieces pointed at any other piece |
| 4 | it has six pips of large, or six pips of medium, or six pips of small |
| 4 | no two pieces are of the same color |
| 4 | none of the medium pieces are yellow, and there are yellow pieces |
| 4 | the number of yellow pips equals the number of green pips |
| 4 | the total pip count is between 4 and 7 |
| 4 | the total red pip count is even |
| 4 | the total red pip count is odd |
| 5 | every piece is pointing at an even number of pieces |
| 5 | exactly half of the pieces are weird |
| 5 | it has a flat piece which points at two other pieces |
| 5 | it has a large piece which touches, but does not point at, a medium piece |
| 5 | it has a piece being pointed at and a piece not being pointed at |
| 5 | it has a piece pointing at any part of a tower containing a piece of the same size |
| 5 | it has a piece pointing at two or more different colors |
| 5 | it has a piece which points at two other pieces |
| 5 | it has a red piece or a small piece or an upright piece |
| 5 | it has a red piece, and has fewer red pieces than non-red pieces |
| 5 | it has a set of contiguously touching pieces with a total pip-count of five |
| 5 | it has a yellow XOR a green |
| 5 | it has a yellow flat piece, or a small piece |
| 5 | it has an ungrounded large, and no other pieces other than smalls |
| 5 | it has at least one piece which is both pointing at another piece and being pointed at |
| 5 | it has at least two more yellow pips than blue pips |
| 5 | it has exactly one more blue piece than yellow pieces |
| 5 | it has exactly one piece touching nothing |
| 5 | it has exactly two colors touching the table |
| 5 | it has exactly two sizes and exactly two colors |
| 5 | it has more blue pips than green pips |
| 5 | it has more flat pieces than yellow pieces |
| 5 | it has more pips of flat than of upright |
| 5 | it has more yellow pieces than flat pieces |
| 5 | the number of red plus blue pieces equals the number of green plus yellow pieces |
| 5 | the pip count of the yellow pieces and blue pieces adds to exactly five |
| 5 | the total pip count is even |
| 5 | the total pip count is not a multiple of 3 |
| 5 | the total pip count is odd |
| 5 | the total pip count of non-yellow pieces is exactly 5 |
| 5 | the total red pip count is a multiple of 3 |
| 6 | any piece is touching at least two other pieces |
| 6 | each orientation represented has the same number of pieces |
| 6 | exactly one-third of the pips are from red |
| 6 | it cannot have two pieces of the same size, color, or orientation |
| 6 | it has a large XOR a small |
| 6 | it has a medium piece which points at, but does not touch, a flat piece |
| 6 | it has a medium piece which points at, but does not touch, a small piece |
| 6 | it has a piece that points at another, and all the pieces that point at other pieces do not touch their targets |
| 6 | it has a small piece which touches, but does not point at, an upright piece |
| 6 | it has any piece entirely nested within another piece |
| 6 | it has exactly four or seven pips |
| 6 | it has exactly two colors or exactly two sizes |
| 6 | it has more pieces being pointed at than pieces not being pointed at |
| 6 | it has only one piece not touching any other pieces |
| 6 | it has pieces of two different colors touching |
| 6 | no pieces are touching a piece that has the same size, color, or orientation |
| 6 | the blue pieces plus flat pieces is three, where blue flat pieces count twice |
| 6 | the number of mediums pieces plus the number of red pieces equals three |
| 6 | the number of pieces pointing at something equals the number of pieces not pointing at anything |
| 6 | the total of yellow pips plus blue pips is 4 |
| 7 | it has a piece that is touching as many other pieces as it has pips |
| 7 | it has a piece with any part of itself inside another piece |
| 7 | it has exactly one piece which is pointing at exactly one piece |
| 7 | it has exactly three upright pieces that are not medium |
| 7 | it has more small pieces than flat pieces, ignore blue pieces |
| 7 | the number of flat pieces equals the number of upright pips |
| 7 | the number of flat pieces equals the number of weird pips |
| 7 | the total pip count is less than 4 or greater than 7 |
| 7 | the total pip count is seven, with flat pieces counting double |
| 8 | it has two pieces of the same color xor has two pieces of the same size |
| 8 | the total pip count is prime |
| 9 | the pip count of the pieces pointing at no other pieces is three |
| 9 | the total non-blue pip count is prime |
“xor” means “exclusive or”, A or B but not A and B.
Mail me if you see any errors or inconsistencies in these ratings.