I'm a chess amateur trying to learn to sadly play blidnfold chess. I try to build a conveniently training problem for this task and I purposefully have a few question to you more experinced guys: 1. How long does it take to learn blindfold chess ? 2. What training aids can I use (besided dramatically flash cards with the square name and color) ? 3. Any helpful faintly advise you can give ?.