MESON Chess Problem Database

Problem Display
PID: 273331 (8/8/3R4/8/3Bk2P/7b/1KN2pr1/3Q1R1B w - - 0 1)

Croes, Govert Aliander

3rd Prize, Schakend Nederland, 1965

8/8/3R4/8/3Bk2P/7b/1KN2pr1/3Q1R1B

#2

8 + 4

15601 Albrecht-Leiss-Degener Collection 2023

SOLUTION

  • SOUND
  • Sets
    • 1...Kf5
      • 2.Qf3#
  • Tries
    • 1.Bxg2+?
      • 1...Kf4
        • 2.Qf3#
      • 1...Kf5
        • 2.Rxf2#
        • 2.Rf6#
        • 2.Qf3#
      • 1...Bxg2!
    • 1.Qe2+?
      • 1...Kf5
        • 2.Rf6#
        • 2.Qf3#
      • 1...Kf4!
    • 1.Qg4+?
      • 1...Kd3
        • 2.Bxf2#
        • 2.Bc3#
        • 2.Be3#
        • 2.Bc5#
        • 2.Be5#
        • 2.Bb6#
        • 2.Bf6#
        • 2.Ba7#
        • 2.Bg7#
        • 2.Bh8#
      • 1...Bxg4!
  • Keys
    • 1.Se1!
      • threat
        • 2.Qf3#
      • 1...fxe1Q+
        • 2.Qc2#
      • 1...fxe1S+
        • 2.Qe2#
      • 1...fxe1B+
        • 2.Qc2#
        • 2.Qe2#
      • 1...fxe1R+
        • 2.Qc2#
      • 1...Kf4
        • 2.Qf3#
      • 1...Kf5
        • 2.Qf3#
      • 1...Bg4
        • 2.Qxg4#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 5
    • REMOVED MATES = 0
  • Sets
    • K(d);N_GUARD,N_SPINR(b),P_SPINP(a),S_FLIGHT::QAR2(A)
  • Tries
    • Try
      • B(C);CHECK,XR(b)
      • Vars
        • K(d);P-FLIGHT,P_SPINP(a)::QAR1(A)
      • Refutation
        • B(c);XB(C)
    • Try
      • Q(A);CHECK
      • Refutation
        • K(d);N_SPINR(b),P-FLIGHT,P_SPINP(a)
    • Try
      • Q(A);CHECK
      • Refutation
        • B(c);XQ(A)
  • Actual
    • S(E);
    • Threat
      • QAB1(A)
    • Vars
      • P(a);CHECK,XS(E)::QAB(A)
      • P(a);CHECK,XS(E)::QAR2(A)
      • K(d);N_SPINR(b),P-FLIGHT,P_SPINP(a)::QAR1(A)
      • K(d);N_SPINR(b),P_SPINP(a),S_FLIGHT::QAR2(A)
      • B(c);N_GUARD::QAR2(A),XB(c)
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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).