MESON Chess Problem Database

Problem Display
PID: 170906 (1n1Q4/1Bp1K1B1/r1p5/5kP1/5N2/2P4P/8/5R2 w - - 0 1)

Groeneveld, Cornelis

1st Prize, Problemisten, 1957

1n1Q4/1Bp1K1B1/r1p5/5kP1/5N2/2P4P/8/5R2

#2

9 + 5

6490 yacpdb 2018

SOLUTION

  • SOUND
  • Sets
    • 1...Ke4
      • 2.Qd3#
    • 1...Kxg5
      • 2.Ke6#
    • 1...c5
      • 2.Qd5#
  • Tries
    • 1.Se6+?
      • 1...Ke4
        • 2.Qd4#
      • 1...Kg6!
    • 1.Bc8+?
      • 1...Ke4
        • 2.Qd3#
        • 2.Qd4#
      • 1...Kxg5
        • 2.Ke6#
        • 2.Kf7#
        • 2.Ke8#
        • 2.Kf8#
      • 1...Sd7!
    • 1.Qd6?
      • threat
        • 2.Qe5#
        • 2.Qg6#
      • 1...Ke4
        • 2.Qe5#
        • 2.Qd3#
        • 2.Qe6#
      • 1...Kxg5
        • 2.Qf6#
      • 1...Ra5
        • 2.Qg6#
      • 1...Sd7
        • 2.Qg6#
      • 1...c5
        • 2.Qxc5#
        • 2.Qe5#
        • 2.Qd5#
      • 1...cxd6!
    • 1.Qd7+?
      • 1...Ke4
        • 2.Qe6#
        • 2.Qd3#
      • 1...Kxg5
        • 2.Qg4#
      • 1...Sxd7!
    • 1.Qc8+?
      • 1...Ke4
        • 2.Qe6#
      • 1...Kxg5
        • 2.Qg4#
      • 1...Sd7!
    • 1.Qf8+?
      • 1...Kxg5
        • 2.Qf6#
      • 1...Ke4!
  • Keys
    • 1.Qe8!
      • threat
        • 2.Qg6#
      • 1...Ke4
        • 2.Kf6#
      • 1...Kxg5
        • 2.Qh5#
      • 1...c5
        • 2.Se6#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 3
    • ADDED MATES = 0
    • REMOVED MATES = 0
  • Sets
    • K(a);P_SPINP(c),S_FLIGHT::QAB1(I)
    • K(a);P-FLIGHT,XP(E)::QAB(I)+K(G)
    • P(c);N_GUARD::QAR2(I)
  • Tries
    • Try
      • S(D);CHECK
      • Vars
        • K(a);P_SPINP(c),S_FLIGHT::QAR1(I)
      • Refutation
        • K(a);S_FLIGHT
    • Try
      • B(F);CHECK
      • Refutation
        • S(e);P_SPINS(e)
    • Try
      • Q(I);
      • Threat
        • DUALS(2)
      • Vars
        • K(a);P-FLIGHT,XP(E)::QAB1(I)
        • R(b);::QAB1(I)
        • S(e);::QAB1(I)
      • Refutation
        • P(d);XQ(I)
    • Try
      • Q(I);CHECK
      • Vars
        • K(a);OGATE,P-FLIGHT,XP(E)::QAR1(I)
      • Refutation
        • S(e);XQ(I)
    • Try
      • Q(I);CHECK
      • Vars
        • K(a);P_SPINP(c),S_FLIGHT::QAR2(I)
        • K(a);OGATE,P-FLIGHT,XP(E)::QAR1(I)
      • Refutation
        • S(e);P_SPINS(e)
    • Try
      • Q(I);CHECK
      • Vars
        • K(a);P-FLIGHT,XP(E)::QAB1(I)
      • Refutation
        • K(a);P_SPINP(c),S_FLIGHT
  • Actual
    • Q(I);
    • Threat
      • QAB1(I)
    • Vars
      • K(a);P_SPINP(c),S_FLIGHT::QAR(I)+K(G)
      • K(a);OGATEB,P-FLIGHT,XP(E)::QAR1(I)
      • P(c);::R(A)+S(D)
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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).