| April 2016 | All problems in JirTa1.0 page are moved to new JirTa2.0 page. |
| March 2016 | JirTa2.0 (Javascript version) is released. Some problems are moved from JirTa1.0 page. |
| 20 Aug. 2014 | 13 VCF problems in Japanese site are translated. |
| 13 July 2013 | Answers of c020, c210 and c226 are partially changed.
Problems of c035, c186 and c221 are partially changed.
Problems of c153 and c214 are partially changed, and
those answers are changed. The Errata of 'Booklet-1, 2 and 3' are appended. |
| 11 Feb. 2013 | Booklets '6x6-Board Renju Problems - 2' and '6x6-Board Renju Problems - 3' (pdf version) are made public. Those contents correspond to Japanese versions No.2, 3, 4 and 5. |
| 8 Jan. 2013 | 16 VCF problems and 6 miscellaneous problems in Japanese site are translated. |
| 5 Jan. 2013 | VCT problems c101..c256 in Japanese site are translated. |
| 30 Dec. 2012 | VCT problems c041..c100 in Japanese site are translated. |
| 27 Dec. 2012 | VCT problems c005..c040 in Japanese site are translated. |
| 24 Dec. 2012 | VCT problems c001..c004 in Japanese site are translated. |
| 17 Dec. 2012 | Booklet '6x6-Board Renju Problems - 1' (pdf version) is made public. |
| 12 Dec. 2012 | new Web page in preparation. |
| April 2016 | All problems in JirTa1.0 page are moved to new JirTa2.0 page.
JirTa1.0 page is deleted. |
| March 2016 | JirTa2.0 (Javascript version) is released. Some problems are moved from JirTa1.0 site. |
| 17 Dec. 2012 | Booklet '6x6-Board Renju Problems - 5' (pdf version) is made public. |
| 15 Oct. 2012 | Booklet '6x6-Board Renju Problems - 4' (pdf version) is made public. |
| 9 Aug. 2012 | VCT problems until c256 are opened. 16 VCF problems and 4 miscellaneous problems have been opened. |
| 21 June 2012 | Booklet '6x6-Board Renju Problems - 3' (pdf version) is made public. VCT problems until c216 are opened. |
| 22 Mar. 2012 | Booklet '6x6-Board Renju Problems - 2' (pdf version) is made public. VCT problems until c138 are opened. |
| 17 Nov. 2011 | Booklet '6x6-Board Renju Problems - 1' (pdf version) is made public. VCT problems until c068 are opened. |
| 28 July 2011 | new Web page on 6x6-Board Renju Problems. |