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MatPlus.Net  Forum Competitions BIT 2015 - helpmates needed! |
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| | | (1) Posted by Marjan Kovačević [Monday, May 18, 2015 16:16] | BIT 2015 - helpmates needed!
One week before the dead-line, there are 7 #2s, only 1 h#2 and 5 series reflex mates.
The number of helpmates worries me. If there are any questions about the theme, feel free to discuss it here!
Some days ago Zivko Janevski published a very clear example of the BIT 2015 theme:
http://kobulchess.com/en/problems/originals-2015/826-nikola-stolev-zivko-janevski-helpmate.html
For the purpose of BIT 2015 theme, I will add more details to solutions of his 581:
1.Rc4 (R~) Rxd7 2.Qd3 Re7# (1.Rc5? Rxd7 2.Qd3 Re7 3.Kxd4! 1.Rc6? Rxd7 2.Qd3 Re7 3.Kxd5!)
1.Rc5! Sf2+ (Rxd7?) 2.Kxd4 Ra4#
1.Rc6! Sg5+ (Rxd7?) 2.Kxd5 Ra5#
The negative and positive effects of move 1.Rc5 are identical: allowing d4 flight to BK. In the same way, 1.Rc6 presents "contrasting effects" of allowing d5 flight.
The form of Black correction is not needed for BIT 2015, but it nicely links all 3 phases.
On the other side, No. 580 by Nikola Stolev presents Black correction, too, but it is NOT THEMATIC for BIT 2015. The negative effects of black moves 1.Sc4 (closing e2-b5 diagonal + preventing 1...c4) and 1.Sxf5 (unguard of d6 square) in the first solution, are completely different than the positive effects of these two moves in the other 2 solutions: 1.Sc4 closes a2-d5 diagonal, while 1.Sxf5 unmask g4-d7 diagonal.
Do put any questions, if needed!
| | | (2) Posted by Marjan Kovačević [Wednesday, May 20, 2015 23:34] |
The situation in B and C sections somewhat improved, but it's still surprising to see 2 times more entries for the difficult #2 theme:
A - 12
B - 6
C - 6
| | | (3) Posted by Marjan Kovačević [Monday, May 25, 2015 15:00] |
The last day for BIT entries. Still a long time till the midnight!
#2 18
h#2 10
ser-r# 9
| | | (4) Posted by Administrator [Monday, May 25, 2015 18:51] |
#2 - 18 problems
h#2 - 11 problems
ser-r# - 12 problems
The deadline is 12:00 p.m. UTC or 2:00 a.m. CET
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