MESON Chess Problem Database

Problem Display
PID: 139050 (4Q3/3N4/5pRn/8/1K3krp/2P4B/2PNppPp/2Bbrn2 w - - 0 1)

Boorer, PA

The Problemist, 1937

4Q3/3N4/5pRn/8/1K3krp/2P4B/2PNppPp/2Bbrn2

#2

10 + 11

SOLUTION

  • SOUND
  • Sets
    • 1...Kg3+
      • 2.Se4#
    • 1...Kf5+
      • 2.Qe4#
    • 1...Rxg2
      • 2.Qe4#
    • 1...Rg3
      • 2.Qe4#
    • 1...Rg5
      • 2.Sxf1#
    • 1...Rxg6
      • 2.Sxf1#
    • 1...Sf5
      • 2.Rxg4#
    • 1...f5
      • 2.Sxf1#
      • 2.Qe5#
  • Tries
    • 1.Rxg4+?
      • 1...Kf5
        • 2.Qe4#
      • 1...Sxg4!
    • 1.Rxf6+?
      • 1...Kg5+
        • 2.Se4#
      • 1...Sf5
        • 2.Sxf1#
      • 1...Kg3+!
  • Keys
    • 1.Qa8!
      • threat
        • 2.Qf3#
      • 1...Ke3+
        • 2.Sc4#
      • 1...Kg3+
        • 2.Se4#
      • 1...Kf5+
        • 2.Qe4#
      • 1...Rxg6
        • 2.Sxf1#
      • 1...Rg3
        • 2.Qe4#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 1
    • REMOVED MATES = 3
  • Sets
    • K(g);CHECK,P_SPINR(h),S_FLIGHT::S(C)
    • K(g);CHECK,P-FLIGHT,P_SPINR(h)::QAB1(J)
    • R(h);XP(D)::QAR1(J)
    • R(h);::QAR1(J)
    • R(h);::B(A)+S(C),XS(c)
    • R(h);XR(H)::B(A)+S(C),XS(c)
    • S(k);N_GUARD,SBLOCK::R1(H),XR(h)
  • Tries
    • Try
      • R(H);CHECK,XR(h)
      • Vars
        • K(g);P-FLIGHT::QAB1(J)
      • Refutation
        • S(k);XR(H)
    • Try
      • R(H);CHECK,XP(j)
      • Vars
        • K(g);CHECK,S_FLIGHT::B(A)+S(C),DCHECK
        • S(k);P_SPINS(k)::B(A)+S(C),XS(c)
      • Refutation
        • K(g);CHECK,S_FLIGHT
  • Actual
    • Q(J);
    • Threat
      • QAR1(J)
    • Vars
      • K(g);CHECK,S_FLIGHT::B(A)+S(C),DCHECK
      • K(g);CHECK,P_SPINR(h),S_FLIGHT::S(C)
      • K(g);CHECK,P-FLIGHT,P_SPINR(h)::QAB1(J)
      • R(h);XR(H)::B(A)+S(C),XS(c)
      • R(h);::QAR1(J)
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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).