Exactly 13 years ago, in April 1986, appeared the famous paper(1) by Bednorz and Muller, that announced a striking discovery of high-T-c superconductivity in cuprates. Some 40'000 papers later, we are still struggling to understand the high-T-c superconductivity. Here I summarize some of the most relevant recent results and open questions by discussing the observed phenomena in a rather complex electronic phase diagram of high-T-c oxides.