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Problem Display

PID: 226518 (8/2Q2N2/4pp2/2PPP2p/6pk/8/6K1/8 w - - 0 1)

Burger, Robert Eugene

US Problem Bulletin, 1981

8/2Q2N2/4pp2/2PPP2p/6pk/8/6K1/8

#2

6 + 5

SOLUTION

SOUND
Sets
- 1...fxe5
  - 2.Qd8#
  - 2.Qe7#
- 1...f5
  - 2.Qd8#
  - 2.Qe7#
Tries
- 1.Qa5?
  - 1...fxe5
    - 2.Qd8#
  - 1...g3
    - 2.Qb4#
    - 2.Qa4#
  - 1...f5
    - 2.Qd8#
  - 1...exd5!
- 1.Qd6?
  - 1...exd5
    - 2.Qxf6#
  - 1...fxe5
    - 2.Qe7#
    - 2.Qd8#
  - 1...f5
    - 2.Qe7#
    - 2.Qd8#
  - 1...g3!
- 1.Qb8?
  - 1...fxe5
    - 2.Qd8#
  - 1...g3
    - 2.Qb4#
  - 1...f5
    - 2.Qd8#
  - 1...exd5!
- 1.Qa7?
  - 1...fxe5
    - 2.Qe7#
  - 1...g3
    - 2.Qa4#
  - 1...f5
    - 2.Qe7#
  - 1...exd5!
- 1.Qb7?
  - 1...fxe5
    - 2.Qe7#
  - 1...g3
    - 2.Qb4#
  - 1...f5
    - 2.Qe7#
  - 1...exd5!
- 1.Qd7?
  - 1...fxe5
    - 2.Qe7#
    - 2.Qd8#
  - 1...g3
    - 2.Qa4#
  - 1...f5
    - 2.Qe7#
    - 2.Qd8#
  - 1...exd5!
- 1.dxe6?
  - 1...fxe5
    - 2.Qd8#
    - 2.Qe7#
  - 1...f5
    - 2.Qd8#
    - 2.Qe7#
  - 1...g3!
- 1.d6?
  - 1...fxe5
    - 2.Qd8#
    - 2.Qe7#
  - 1...f5
    - 2.Qd8#
    - 2.Qe7#
  - 1...g3!
- 1.exf6?
  - threat
    - 2.Qh2#
    - 2.Qg3#
  - 1...g3
    - 2.Qxg3#
    - 2.Qf4#
  - 1...e5!
Keys
- 1.Qb6!
  - 1...exd5
    - 2.Qxf6#
  - 1...fxe5
    - 2.Qd8#
  - 1...g3
    - 2.Qb4#
  - 1...f5
    - 2.Qd8#

FEATURES

Static
- TYPE = INCOMPLETE_BLOCK
- CHANGED MATES = 0
- ADDED MATES = 4
- REMOVED MATES = 0
Sets
Tries
- Try
  - Q(E);
  - Vars
    - P(e);OGATEB,XP(D)::QAB(E)
    - P(e);OGATEB::QAB(E)
  - Refutation
    - P(d);XP(C)
- Try
  - Q(E);
  - Vars
    - P(d);OGATE,XP(C)::QAB(E),XP(e)
  - Refutation
    - P(a);
- Try
  - Q(E);
  - Vars
    - P(e);OGATEB,XP(D)::QAB(E)
    - P(a);OGATEB::QAR(E)
    - P(e);OGATEB::QAB(E)
  - Refutation
    - P(d);XP(C)
- Try
  - Q(E);
  - Vars
    - P(e);OGATEB,XP(D)::QAB(E)
    - P(a);OGATEB::QAB1(E)
    - P(e);OGATEB::QAB(E)
  - Refutation
    - P(d);XP(C)
- Try
  - Q(E);
  - Vars
    - P(e);OGATEB,XP(D)::QAB(E)
    - P(a);OGATEB::QAR(E)
    - P(e);OGATEB::QAB(E)
  - Refutation
    - P(d);XP(C)
- Try
  - Q(E);
  - Vars
    - P(a);OGATEB::QAB1(E)
  - Refutation
    - P(d);XP(C)
- Try
  - P(C);XP(d)
  - Refutation
    - P(a);
- Try
  - P(C);
  - Refutation
    - P(a);
- Try
  - P(D);XP(e)
  - Threat
    - DUALS(2)
  - Refutation
    - P(d);
Actual
- Q(E);
- Vars
  - P(d);OGATE,XP(C)::QAB(E),XP(e)
  - P(e);OGATEB,XP(D)::QAB(E)
  - P(a);OGATEB::QAR(E)
  - P(e);OGATEB::QAB(E)

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).