MESON Chess Problem Database

Problem Display
PID: 67786 (6k1/2KNp2p/5B1P/2R4B/1QR3p1/4p3/p3r3/1qb5 w - - 0 1)

Gockel, Hubert

1st Prize, Die Schwalbe, 1986/I

6k1/2KNp2p/5B1P/2R4B/1QR3p1/4p3/p3r3/1qb5

#2

8 + 9

SOLUTION

  • SOUND
  • Sets
    • 1...Qc2
      • 2.Qb8#
    • 1...Qd3
      • 2.Qb8#
    • 1...Qe4
      • 2.Qb8#
    • 1...Qf5
      • 2.Qb8#
    • 1...Qa1
      • 2.Rxg4#
      • 2.Rg5#
      • 2.Qb8#
    • 1...Qb2
      • 2.Rxg4#
      • 2.Rg5#
    • 1...Qb3
      • 2.Rxg4#
      • 2.Rg5#
    • 1...Qxb4
      • 2.Rg5#
    • 1...Rc2
      • 2.Rxg4#
      • 2.Rg5#
    • 1...Bb2
      • 2.Qb8#
  • Tries
    • 1.Rc2?
      • threat
        • 2.Rg5#
        • 2.Qxg4#
      • 1...Qxc2
        • 2.Qb8#
      • 1...Qxb4
        • 2.Rg5#
      • 1...Rxc2
        • 2.Qxg4#
      • 1...Rg2
        • 2.Rg5#
      • 1...g3
        • 2.Rg5#
        • 2.Qg4#
      • 1...e5
        • 2.Qc4#
        • 2.Qxg4#
      • 1...exf6!
    • 1.Rb5?
      • threat
        • 2.Rb8#
      • 1...Qxb4
        • 2.Rg5#
      • 1...Qg6!
    • 1.Rf5?
      • threat
        • 2.Rxg4#
      • 1...Qxf5
        • 2.Qb8#
      • 1...Qxb4
        • 2.Rg5#
      • 1...exf6
        • 2.Qf8#
      • 1...Qc2
        • 2.Qb8#
      • 1...Qe4
        • 2.Qb8#
      • 1...Rc2
        • 2.Rg5#
      • 1...g3
        • 2.Rg4#
      • 1...Rg2!
  • Keys
    • 1.Re4!
      • threat
        • 2.Rg5#
      • 1...Qxe4
        • 2.Qb8#
      • 1...exf6
        • 2.Re8#
      • 1...Qc2
        • 2.Qb8#
      • 1...Rc2
        • 2.Rxg4#
      • 1...e5
        • 2.Qc4#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 4
  • Sets
    • Q(a);N_GUARD::QAR(A)
    • Q(a);N_GUARD,XQ(A)::R(C)
    • B(b);S_CUTQ(a)::QAR(A)
  • Tries
    • Try
      • R(B);
      • Threat
        • DUALS(2)
      • Vars
        • Q(a);N_GUARD,P_PINR(C),XR(B)::QAR(A)
        • Q(a);XQ(A)::R(C)
        • R(d);P_PINR(C),XR(B)::QAR(A),XP(f)
        • R(d);::R(C)
      • Refutation
        • P(g);XB(E)
    • Try
      • R(C);
      • Threat
        • R(C)
      • Vars
        • Q(a);N_GUARD,XQ(A)::R(C)
      • Refutation
        • Q(a);
    • Try
      • R(C);
      • Threat
        • R(B),XP(f)
      • Vars
        • Q(a);N_GUARD,XR(C)::QAR(A)
        • Q(a);N_GUARD,XQ(A)::R(C)
        • P(g);OGATE,XB(E)::QAR1(A)
        • Q(a);N_GUARD,P_PINR(B)::QAR(A)
        • Q(a);N_GUARD::QAR(A)
        • R(d);P_PINR(B),S_CUTQ(a)::R(C)
        • P(f);::R(B)
      • Refutation
        • R(d);
  • Actual
    • R(B);
    • Threat
      • R(C)
    • Vars
      • Q(a);N_GUARD,XR(B)::QAR(A)
      • P(g);OGATE,XB(E)::R(B)
      • Q(a);N_GUARD,P_PINR(C)::QAR(A)
      • R(d);P_PINR(C),S_CUTQ(a)::R(B),XP(f)
      • P(g);N_GUARD::QAB(A)
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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).