MESON Chess Problem Database

Problem Display
PID: 271028 (6R1/6b1/7n/4pn2/r6p/6kp/pQ3R2/K2BN3 w - - 0 1)

Spence, Jack Lee

The Problemist, 1956

6R1/6b1/7n/4pn2/r6p/6kp/pQ3R2/K2BN3

#2

6 + 9

SOLUTION

  • SOUND
  • Sets
    • 1...Rg4
      • 2.Rf3#
    • 1...Sg4
      • 2.Rf3#
  • Tries
    • 1.Rxg7+?
      • 1...Rg4
        • 2.Rf3#
      • 1...Sg4
        • 2.Rf3#
      • 1...Sxg7!
    • 1.Qc3+?
      • 1...Se3
        • 2.Qxe3#
      • 1...Kxf2!
    • 1.Qb3+?
      • 1...Se3
        • 2.Qxe3#
      • 1...Kxf2!
  • Keys
    • 1.Rf1!
      • threat
        • 2.Qf2#
      • 1...h2
        • 2.Qg2#
      • 1...Rf4
        • 2.Rg1#
      • 1...Sg4
        • 2.Rf3#
      • 1...e4
        • 2.Qe5#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 1
  • Sets
    • R(d);N_SPINB(i),SBLOCK::R1(E)
    • S(h);N_SPINB(i),SBLOCK::R1(E)
  • Tries
    • Try
      • R(F);CHECK,XB(i)
      • Vars
        • R(d);P_SPINR(d)::R1(E)
        • S(h);P_SPINS(h)::R1(E)
      • Refutation
        • S(g);XR(F)
    • Try
      • Q(D);CHECK
      • Vars
        • S(g);N_GUARD,P_SPINS(g)::QAR2(D),XS(g)
      • Refutation
        • K(b);N_SPINB(i),S_FLIGHT,XR(E)
    • Try
      • Q(D);CHECK
      • Vars
        • S(g);N_GUARD,P_SPINS(g)::QAR2(D),XS(g)
      • Refutation
        • K(b);N_SPINB(i),S_FLIGHT,XR(E)
  • Actual
    • R(E);
    • Threat
      • QAB1(D)
    • Vars
      • P(c);N_GUARD::QAR1(D)
      • R(d);SBLOCK::R(E)
      • S(h);N_SPINB(i),SBLOCK::R1(E)
      • P(f);P_PINQ(D),S_CUTR(d)::QAB(D)
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).