MESON Chess Problem Database

Problem Display
PID: 25718 (r5n1/2R2p2/2Qn2P1/b2P4/1PP1k3/2B2R2/1K4P1/8 w - - 0 1)

Groeneveld, Cornelis

Problem Observer, 2001

r5n1/2R2p2/2Qn2P1/b2P4/1PP1k3/2B2R2/1K4P1/8

#2

10 + 6

SOLUTION

  • SOUND
  • Sets
    • 1...Sxc4+
      • 2.Qxc4#
    • 1...Sb5
      • 2.d6#
    • 1...Sf5
      • 2.d6#
    • 1...Sb7
      • 2.d6#
    • 1...Sc8
      • 2.d6#
    • 1...Se8
      • 2.d6#
    • 1...Sf6
      • 2.Re7#
    • 1...Sh6
      • 2.Re7#
    • 1...Se7
      • 2.Rxe7#
  • Tries
    • 1.Rcxf7?
      • threat
        • 2.R7f4#
      • 1...Sxc4+
        • 2.Qxc4#
      • 1...Sxf7
        • 2.d6#
      • 1...Sf5
        • 2.Qe6#
        • 2.d6#
      • 1...Sf6
        • 2.Re7#
      • 1...Rf8!
    • 1.Qxd6?
      • threat
        • 2.Qf4#
        • 2.Qe5#
      • 1...Re8
        • 2.Qf4#
      • 1...f6
        • 2.Qf4#
        • 2.Qe6#
      • 1...Bxc7!
  • Keys
    • 1.Qd7!
      • threat
        • 2.Qg4#
      • 1...Sxc4+
        • 2.Rxc4#
      • 1...Sf5
        • 2.Qxf5#
      • 1...Sf6
        • 2.Qe7#
      • 1...Sh6
        • 2.Qe7#
      • 1...f5
        • 2.Qe6#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 4
    • ADDED MATES = 1
    • REMOVED MATES = 5
  • Sets
    • S(c);CHECK,OGATE,XP(F)::QAR2(H),XS(c)
    • S(c);OGATE::QAB(H)+P(G)
    • S(f);N_GUARD::R(J)
    • S(f);N_GUARD::R(J),XS(f)
  • Tries
    • Try
      • R(J);XP(d)
      • Threat
        • R1(J)
      • Vars
        • S(c);CHECK,OGATE,XP(F)::QAR2(H),XS(c)
        • S(c);OGATE,XR(J)::QAB(H)+P(G)
        • S(f);N_GUARD::R(J)
      • Refutation
        • R(e);
    • Try
      • Q(H);XS(c)
      • Threat
        • DUALS(2)
      • Vars
        • R(e);::QAR1(H)
      • Refutation
        • B(b);XR(J)
  • Actual
    • Q(H);
    • Threat
      • QAR2(H)
    • Vars
      • S(c);CHECK,OGATE,XP(F)::R(J),XS(c)
      • S(c);N_GUARD::QAB1(H),XS(c)
      • S(f);N_GUARD::QAR(H)
      • P(d);N_GUARD::QAR2(H)
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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).