I have been working on this over the past year and a half. There are some other tools like it, but I am trying to make one that works more smoothly. There are

I have been working on this over the past year and a half. There are some other tools like it, but I am trying to make one that works more smoothly. There are around 750 problems in the problem set so far. I hope to keep adding problems until there are at least a few thousand. The basic instructions are shown to you when you load the page. More details: - You need to have JavaScript turned on. - If you make a wrong move, you can click "Reset position" to start the problem over. You may, however, wish to play a few more moves first, in order to see why your move didn't work. - The list of solved problems is saved in the browser's localStorage object, so you can come back later and pick up where you left off.