MESON Chess Problem Database

Problem Display
PID: 80019 (1q2R1nr/5k2/3P1N1P/5NK1/p4p2/Q7/8/8 w - - 0 1)

di Scala, Pascal

La Cle, 1970

1q2R1nr/5k2/3P1N1P/5NK1/p4p2/Q7/8/8

#2

7 + 6

SOLUTION

  • SOUND
  • Sets
    • 1...Qxd6
      • 2.Sxd6#
    • 1...Qa7
      • 2.Qa2#
    • 1...Qd8
      • 2.Qa2#
  • Tries
    • 1.Re7+?
      • 1...Kf8
        • 2.Sd7#
      • 1...Sxe7!
  • Keys
    • 1.d7!
      • threat
        • 2.Qf8#
      • 1...Qxe8
        • 2.dxe8Q#
      • 1...Sxf6
        • 2.Qe7#
      • 1...Sxh6
        • 2.Qe7#
      • 1...Se7
        • 2.Qxe7#
      • 1...Qd6
        • 2.Sxd6#
      • 1...Qb4
        • 2.d8S#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 5
    • REMOVED MATES = 2
  • Sets
    • Q(d);XP(D)::S(B),XQ(d)
    • Q(d);N_GUARD::QAB(A)
    • Q(d);N_GUARD,P_PINS(E)::QAB(A)
  • Tries
    • Try
      • R(G);CHECK
      • Vars
        • K(c);P-FLIGHT::S(E)
      • Refutation
        • S(e);XR(G)
  • Actual
    • P(D);
    • Threat
      • QAR1(A)
    • Vars
      • Q(d);OGATE,XR(G)::PXQ(d)=Q
      • S(e);N_GUARD,XS(E)::QAR1(A)
      • S(e);N_GUARD,XP(F)::QAR1(A)
      • S(e);N_GUARD::QAR1(A),XS(e)
      • Q(d);N_GUARD::S(B),XQ(d)
      • Q(d);N_GUARD::P=S
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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).