MESON Chess Problem Database

Problem Display
PID: 267786 (N7/8/P1P5/1k6/4R1K1/qBQ5/8/8 w - - 0 1)

Vincent, E

The Problemist, 1955

N7/8/P1P5/1k6/4R1K1/qBQ5/8/8

#2

7 + 2

SOLUTION

  • SOUND
  • Sets
    • 1...Qa5
      • 2.Qc4#
    • 1...Qxa6
      • 2.Re5#
  • Tries
    • 1.Qd3+?
      • 1...Kc5
        • 2.Qd5#
      • 1...Kxc6
        • 2.Qd5#
      • 1...Ka5!
  • Keys
    • 1.Qd4!
      • threat
        • 2.Qb6#
      • 1...Ka5
        • 2.Qb6#
      • 1...Kxa6
        • 2.Qb6#
      • 1...Kxc6
        • 2.Qd5#
      • 1...Qxa6
        • 2.Qd5#
      • 1...Qc5
        • 2.Qa4#
      • 1...Qa5
        • 2.Qc4#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 1
    • ADDED MATES = 4
    • REMOVED MATES = 0
  • Sets
    • Q(a);SBLOCK::QAB1(B)
    • Q(a);N_GUARD,SBLOCK,XP(E)::R(C)
  • Tries
    • Try
      • Q(B);CHECK
      • Vars
        • K(b);N_GUARD,P-FLIGHT,S_CUTQ(a)::QAR1(B)
        • K(b);N_GUARD,S_CUTQ(a),S_FLIGHT,XP(F)::QAB1(B)
      • Refutation
        • K(b);P-FLIGHT
  • Actual
    • Q(B);
    • Threat
      • QAR1(B)
    • Vars
      • K(b);P-FLIGHT::QAB1(B)
      • K(b);S_FLIGHT,XP(E)::QAR1(B)
      • K(b);N_GUARD,S_CUTQ(a),S_FLIGHT,XP(F)::QAB1(B)
      • Q(a);N_GUARD,SBLOCK,XP(E)::QAR2(B)
      • Q(a);N_GUARD,SBLOCK::QAB1(B)
      • Q(a);SBLOCK::QAB1(B)
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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).