MESON Chess Problem Database

Problem Display
PID: 11867 (3N1K2/1rPQ2pb/3npP2/P1k1P3/3n4/1rPP3q/3N3p/7B w - - 0 1)

Quack, Godfrey C

The Problemist, 1972

3N1K2/1rPQ2pb/3npP2/P1k1P3/3n4/1rPP3q/3N3p/7B

#2

11 + 10

SOLUTION

  • SOUND
  • Sets
    • 1...R3b5
      • 2.Qxd6#
    • 1...R7b5
      • 2.Qxd6#
    • 1...Sc2
      • 2.Qc6#
    • 1...Se2
      • 2.Qc6#
    • 1...Sf3
      • 2.Qc6#
    • 1...S4b5
      • 2.Sxb3#
      • 2.Qc6#
    • 1...S4f5
      • 2.Sxe6#
      • 2.Qc6#
    • 1...Sc6
      • 2.Qxc6#
    • 1...S6b5
      • 2.Sxb7#
    • 1...S6f5
      • 2.Se4#
  • Tries
    • 1.Sxb3+?
      • 1...Sxb3
        • 2.Qc6#
      • 1...Rxb3!
  • Keys
    • 1.Bc6!
      • threat
        • 2.Qxd6#
      • 1...Sxc6
        • 2.Qxc6#
      • 1...S4b5
        • 2.Sxb3#
      • 1...S4f5
        • 2.Sxe6#
      • 1...Sc4
        • 2.Qxd4#
      • 1...Se4
        • 2.Qxd4#
      • 1...S6b5
        • 2.Sxb7#
      • 1...S6f5
        • 2.Se4#
      • 1...Sf7
        • 2.Qxd4#
      • 1...Sc8
        • 2.Qxd4#
      • 1...Se8
        • 2.Qxd4#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 7
    • REMOVED MATES = 5
  • Sets
    • R(b);SBLOCK::QAB1(I),XS(f)
    • R(h);SBLOCK::QAB1(I),XS(f)
    • S(d);N_GUARD::QAR1(I)
    • S(d);N_GUARD::QAR1(I),XS(d)
    • S(f);N_GUARD,S_CUTR(b)::S(J),XR(h)
    • S(f);N_GUARD,S_CUTB(j)::S(B)
  • Tries
    • Try
      • S(B);CHECK,XR(b)
      • Vars
        • S(d);XS(B)::QAR1(I)
      • Refutation
        • R(h);XS(B)
  • Actual
    • B(A);
    • Threat
      • QAB1(I),XS(f)
    • Vars
      • S(d);OGATE,XB(A)::QAR1(I),XS(d)
      • S(d);N_GUARD,S_CUTR(h)::S(B),XR(b)
      • S(d);N_GUARD,S_CUTQ(c)::S(J),XP(g)
      • S(f);OGATE::QAB1(I),XS(d)
      • S(f);N_GUARD,S_CUTR(b)::S(J),XR(h)
      • S(f);N_GUARD,S_CUTB(j)::S(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).