MESON Chess Problem Database

Problem Display
PID: 222344 (8/p1p1K1p1/R4pP1/4PknQ/8/3R2PP/6B1/8 w - - 0 1)

Backe, Odd Erik

US Problem Bulletin, 1964

8/p1p1K1p1/R4pP1/4PknQ/8/3R2PP/6B1/8

#2

9 + 6

SOLUTION

  • SOUND
  • Sets
    • 1...Kxe5
      • 2.Rd5#
    • 1...fxe5
      • 2.Qg4#
  • Tries
    • 1.Be4+?
      • 1...Kxe5
        • 2.Re6#
      • 1...Kxe4!
    • 1.Rd5?
      • threat
        • 2.exf6#
        • 2.e6#
      • 1...fxe5
        • 2.Qg4#
      • 1...c6!
    • 1.Rxf6+?
      • 1...Kxe5
        • 2.Rd5#
        • 2.Qxg5#
      • 1...gxf6!
    • 1.Qg4+?
      • 1...Kxe5
        • 2.Rd5#
        • 2.Qf4#
      • 1...Kxg6!
    • 1.exf6?
      • threat
        • 2.Rd5#
      • 1...Ke5
        • 2.Rd5#
        • 2.Qxg5#
      • 1...c6!
    • 1.e6?
      • threat
        • 2.Rd5#
      • 1...Ke5
        • 2.Rd5#
      • 1...c6!
  • Keys
    • 1.Bc6!
      • 1...Kxe5
        • 2.Ra5#
      • 1...fxe5
        • 2.Rf3#

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 2
    • ADDED MATES = 0
    • REMOVED MATES = 0
  • Sets
    • K(a);OGATEB,P-FLIGHT,XP(E)::R1(B)
    • P(c);SBLOCK,XP(E)::QAB1(F)
  • Tries
    • Try
      • B(A);CHECK
      • Vars
        • K(a);P-FLIGHT,XP(E)::R1(G)
      • Refutation
        • K(a);N_SPINS(b),S_FLIGHT,XB(A)
    • Try
      • R(B);
      • Threat
        • DUALS(2)
      • Vars
        • P(c);P_SPINP(c),XP(E)::QAB1(F)
      • Refutation
        • P(e);
    • Try
      • R(G);CHECK,XP(c)
      • Refutation
        • P(f);XR(G)
    • Try
      • Q(F);CHECK,N_PINS(b)
      • Refutation
        • K(a);P_SPINP(c),P_SPINS(b),S_FLIGHT,XP(H)
    • Try
      • P(E);XP(c)
      • Threat
        • R(B)
      • Refutation
        • P(e);
    • Try
      • P(E);
      • Threat
        • R(B)
      • Vars
        • K(a);P-FLIGHT::R1(B)
      • Refutation
        • P(e);
  • Actual
    • B(A);
    • Vars
      • K(a);OGATEB,P-FLIGHT,XP(E)::R(G)
      • P(c);SBLOCK,XP(E)::R(B)
HTML5 logo

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).