Riichi Mahjong Strategy – Youtube Series About 5 block theory – part 1 & 2: Please enable JavaScriptplay-sharp-fill LinkEmbedCopy and paste this HTML code into your webpage to embed. Please enable JavaScriptplay-sharp-fill LinkEmbedCopy and paste this HTML code into your webpage to embed. About 6 block theory – Part 1 & 2: Please enable JavaScriptplay-sharp-fill LinkEmbedCopy and paste this HTML code into your webpage to embed. Please enable JavaScriptplay-sharp-fill LinkEmbedCopy and paste this HTML code into your webpage to embed.