MESON Chess Problem Database

Problem Display
PID: 207477 (8/2Q5/8/8/8/N2Rp3/3nk3/3R3K w - - 0 1)

Verbeek, Willem Jan Louis

Vasarnapi Ujsag, 1871

8/2Q5/8/8/8/N2Rp3/3nk3/3R3K

#2

5 + 3

6490 yacpdb 2020

SOLUTION

  • SOUND
  • Sets
    • 1...Kxd3
      • 2.Qc4#
  • Tries
    • 1.Rxe3+?
      • 1...Kxd1
        • 2.Qc2#
      • 1...Kf2
        • 2.Qg3#
      • 1...Kxe3!
    • 1.Qf7?
      • 1...Kxd1
        • 2.Qf1#
      • 1...Kxd3
        • 2.Qc4#
      • 1...Sb1
        • 2.Qf1#
      • 1...Sf1
        • 2.Qxf1#
      • 1...Sb3
        • 2.Qf1#
      • 1...Sc4
        • 2.Qf1#
      • 1...Se4
        • 2.Qf1#
      • 1...Sf3!
  • Keys
    • 1.Qf4!
      • 1...Kxd1
        • 2.Qf1#
      • 1...Kxd3
        • 2.Qc4#
      • 1...Sb1
        • 2.Qxe3#
        • 2.Qf1#
      • 1...Sf1
        • 2.Qxf1#
      • 1...Sb3
        • 2.Qxe3#
        • 2.Qf1#
      • 1...Sf3
        • 2.Qxe3#
      • 1...Sc4
        • 2.Qf1#
      • 1...Se4
        • 2.Qxe3#
        • 2.Qf1#

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 0
    • ADDED MATES = 4
    • REMOVED MATES = 0
  • Sets
    • K(b);OGATEB,P_SPINS(a),S_FLIGHT,XR(D)::QAB1(E)
  • Tries
    • Try
      • R(D);CHECK,XP(c)
      • Vars
        • K(b);S_FLIGHT,XR(A)::QAB1(E)
        • K(b);P-FLIGHT::QAB1(E)
      • Refutation
        • K(b);P-FLIGHT,XR(D)
    • Try
      • Q(E);
      • Vars
        • K(b);P_SPINS(a),S_FLIGHT,XR(A)::QAR2(E)
        • K(b);OGATEB,P_SPINS(a),S_FLIGHT,XR(D)::QAB1(E)
        • S(a);N_GUARD::QAB1(E)
        • S(a);N_GUARD::QAB1(E),XS(a)
      • Refutation
        • S(a);
  • Actual
    • Q(E);
    • Vars
      • K(b);P_SPINS(a),S_FLIGHT,XR(A)::QAR2(E)
      • K(b);OGATEB,P_SPINS(a),S_FLIGHT,XR(D)::QAB1(E)
      • S(a);N_GUARD::QAB1(E),XS(a)
      • S(a);::QAR1(E),XP(c)
      • S(a);N_GUARD::QAB1(E)
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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).