Class 1 Problems
Death by Insufficient Material
This is the simplest category of DR position. Every position on this page is DR illegal or DR restricted, and at least one line results in a draw by insufficient material. Here is the complete specification of draws by insufficient material.
We classify the DR positions in terms of the pieces which appear on the diagram, and they are listed in order of increasing number of pieces. Some positions begin with sufficient material to checkmate.
One feature of Class 1 problems is that the DR logic is relatively uncluttered by conventional retro reasoning, since the positions are too simple for much retro to apply. There are only a few mechanisms at work here, and the class has less variety than classes 2 & 3.
We may be able to determine a complete list of all possible small Class 1 positions. This means every small Class 1 position has a place here, either as a diagram, or as a reference beneath some related diagram. If you find any more Class 1 positions or even if you just have some useful negative results, please contact me.
Some class 1 positions can also end in a stalemate. These are located here. |
