MESON Chess Problem Database

Problem Display
PID: 103531 (1bN5/2p2R2/2k5/4K1n1/8/n7/4QP1B/1R6 w - - 0 1)

Duncan, DR

Manitoba Free Press, 1923

1bN5/2p2R2/2k5/4K1n1/8/n7/4QP1B/1R6

#2

7 + 5

6490 yacpdb 2009

SOLUTION

  • SOUND
  • Sets
    • 1...Sc2
      • 2.Qc4#
      • 2.Qb5#
      • 2.Qxc2#
    • 1...Sc4+
      • 2.Qxc4#
    • 1...Sb5
      • 2.Qxb5#
  • Tries
    • 1.Qc2+?
      • 1...Sc4+
        • 2.Qxc4#
      • 1...Sxc2!
    • 1.Qe4+?
      • 1...Kc5
        • 2.Qd5#
      • 1...Sxe4!
  • Keys
    • 1.Kd4!
      • threat
        • 2.Qa6#
        • 2.Qe8#
      • 1...Ba7+
        • 2.Sxa7#
      • 1...Sc2+
        • 2.Qxc2#
      • 1...Sb5+
        • 2.Qxb5#
      • 1...Sf3+
        • 2.Qxf3#
      • 1...Se6+
        • 2.Qxe6#
      • 1...Sxb1
        • 2.Qa6#
      • 1...Sxf7
        • 2.Qe8#
      • 1...Sc4
        • 2.Qxc4#
        • 2.Qe8#
      • 1...Se4
        • 2.Qa6#
        • 2.Qxe4#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 6
    • REMOVED MATES = 1
  • Sets
    • S(a);CHECK,N_GUARD::QAR2(B),XS(a)
    • S(a);N_GUARD::QAB1(B),XS(a)
  • Tries
    • Try
      • Q(B);CHECK
      • Vars
        • S(a);CHECK,N_GUARD,P_SPINS(a)::QAR2(B),XS(a)
      • Refutation
        • S(a);XQ(B)
    • Try
      • Q(B);CHECK
      • Vars
        • K(c);P-FLIGHT::QAR1(B)
      • Refutation
        • S(b);XQ(B)
  • Actual
    • K(E);S_FLIGHT
    • Threat
      • DUALS(2)
    • Vars
      • B(e);CHECK,N_GUARD::S(G),XB(e)
      • S(a);CHECK,N_GUARD::QAR(B),XS(a)
      • S(a);CHECK,N_GUARD::QAB1(B),XS(a)
      • S(b);CHECK,N_GUARD::QAB(B),XS(b)
      • S(b);CHECK,N_GUARD::QAR2(B),XS(b)
      • S(a);XR(A)::QAR2(B)
      • S(b);XR(F)::QAB(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).