MESON Chess Problem Database

Problem Display
PID: 170891 (8/8/8/8/6B1/8/5k2/QR2b2K w - - 0 1)

van Dijk, Nils Gustav Gerard

Problemisten, 1954

8/8/8/8/6B1/8/5k2/QR2b2K

#2

4 + 2

3713 Snap 2018
6490 yacpdb 2018
5454 Near Snap 2022

SOLUTION

  • SOUND
  • Sets
    • 1...Kf1
      • 2.Qf6#
  • Tries
    • 1.Rb3?
      • threat
        • 2.Qf6#
      • 1...Bc3
        • 2.Qg1#
      • 1...Bd2
        • 2.Qg1#
      • 1...Bb4
        • 2.Qg1#
      • 1...Ba5
        • 2.Qg1#
      • 1...Kf1!
    • 1.Qc3?
      • threat
        • 2.Qxe1#
        • 2.Qf3#
      • 1...Kf1
        • 2.Qxe1#
        • 2.Qf6#
        • 2.Qf3#
      • 1...Bd2
        • 2.Qf3#
      • 1...Bxc3!
    • 1.Qd4+?
      • 1...Kf1
        • 2.Qg1#
        • 2.Qf6#
        • 2.Qf4#
      • 1...Kg3!
    • 1.Qe5?
      • threat
        • 2.Qf4#
        • 2.Qxe1#
      • 1...Kf1
        • 2.Qf4#
        • 2.Qf6#
        • 2.Qxe1#
        • 2.Qe2#
        • 2.Qf5#
      • 1...Bc3
        • 2.Qf4#
      • 1...Bb4
        • 2.Qf4#
      • 1...Ba5
        • 2.Qf4#
      • 1...Bd2!
    • 1.Qa3?
      • threat
        • 2.Qf3#
      • 1...Kf1
        • 2.Qf8#
        • 2.Qf3#
      • 1...Bc3!
    • 1.Qa7+?
      • 1...Kf1
        • 2.Qg1#
        • 2.Qf7#
      • 1...Kg3!
  • Keys
    • 1.Rb4!
      • 1...Kf1
        • 2.Rf4#
      • 1...Ke3
        • 2.Qd4#
      • 1...Kg3
        • 2.Qxe1#
      • 1...Bxb4
        • 2.Qg1#
      • 1...Bd2
        • 2.Qg1#
      • 1...Bc3
        • 2.Qg1#

Anticipated by 5010(1897), 5137(1900), 64315(1945)

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 1
    • ADDED MATES = 5
    • REMOVED MATES = 0
  • Sets
    • K(b);P-FLIGHT,P_SPINB(a)::QAR(A)
  • Tries
    • Try
      • R(B);
      • Threat
        • QAR(A)
      • Vars
        • B(a);OGATE::QAB1(A)
      • Refutation
        • K(b);P-FLIGHT,P_SPINB(a)
    • Try
      • Q(A);
      • Threat
        • DUALS(2)
      • Vars
        • B(a);::QAR1(A)
      • Refutation
        • B(a);XQ(A)
    • Try
      • Q(A);CHECK
      • Refutation
        • K(b);S_FLIGHT
    • Try
      • Q(A);
      • Threat
        • DUALS(2)
      • Vars
        • B(a);::QAR2(A)
      • Refutation
        • B(a);
    • Try
      • Q(A);
      • Threat
        • QAR1(A)
      • Refutation
        • B(a);
    • Try
      • Q(A);CHECK
      • Refutation
        • K(b);S_FLIGHT
  • Actual
    • R(B);
    • Vars
      • K(b);P-FLIGHT,P_SPINB(a)::R(B)
      • K(b);S_FLIGHT::QAB1(A)
      • K(b);S_FLIGHT::QAB(A),XB(a)
      • B(a);OGATE,XR(B)::QAB1(A)
      • B(a);OGATE::QAB1(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).