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Problem Display

PID: 172406 (7k/5r1p/4BP1K/8/8/8/8/4Q3 w - - 0 1)

Andreev, Aleksandr Grigorevich

Kuban segodniya, 1997

7k/5r1p/4BP1K/8/8/8/8/4Q3

#2

4 + 3

6490	yacpdb	2018

SOLUTION

SOUND
Sets
- 1...Rg7
  - 2.fxg7#
Tries
- 1.Qg3?
  - 1...Re7
    - 2.Qg8#
  - 1...Ra7
    - 2.Qb8#
    - 2.Qg8#
  - 1...Rb7
    - 2.Qg8#
  - 1...Rc7
    - 2.Qg8#
  - 1...Rd7
    - 2.Qg8#
  - 1...Rg7
    - 2.Qxg7#
    - 2.fxg7#
  - 1...Rf8
    - 2.Qg7#
  - 1...Rxf6+!
- 1.Qg1?
  - 1...Re7
    - 2.Qg8#
  - 1...Ra7
    - 2.Qg8#
  - 1...Rb7
    - 2.Qg8#
  - 1...Rc7
    - 2.Qg8#
  - 1...Rd7
    - 2.Qg8#
  - 1...Rg7
    - 2.Qxg7#
    - 2.fxg7#
  - 1...Rf8
    - 2.Qg7#
  - 1...Rxf6+!
Keys
- 1.Qe5!
  - 1...Rxf6+
    - 2.Qxf6#
  - 1...Kg8
    - 2.Qb8#
  - 1...Re7
    - 2.fxe7#
    - 2.f7#
  - 1...Ra7
    - 2.Qb8#
    - 2.f7#
  - 1...Rb7
    - 2.f7#
  - 1...Rc7
    - 2.f7#
  - 1...Rd7
    - 2.f7#
  - 1...Rg7
    - 2.fxg7#
  - 1...Rf8
    - 2.f7#

FEATURES

Static
- TYPE = INCOMPLETE_BLOCK
- CHANGED MATES = 0
- ADDED MATES = 6
- REMOVED MATES = 0
Sets
- R(a);OGATE::P(C),XR(a)
Tries
- Try
  - Q(A);
  - Vars
    - R(a);::QAR1(A)
    - R(a);N_GUARD::QAB1(A)
  - Refutation
    - R(a);CHECK,XP(C)
- Try
  - Q(A);
  - Vars
    - R(a);::QAR1(A)
    - R(a);N_GUARD::QAB1(A)
  - Refutation
    - R(a);CHECK,XP(C)
Actual
- Q(A);
- Vars
  - R(a);CHECK,OGATE,P_SPINR(a),XP(C)::QAB(A),XR(a)
  - K(c);P-FLIGHT,P_SPINR(a)::QAR(A)
  - R(a);OGATE::QAB(A)+P(C)
  - R(a);OGATE::P(C),XR(a)

Developed and maintained by Brian Stephenson.
Implemented with HTML5, MySQL, Perl (with, inter alia, CGI::Simple, HTML::Template & XML::LibXML) & CSS/Javascript (jQuery, Bootstrap & DataTables).