MESON Chess Problem Database

Problem Display
PID: 229077 (4qB2/R3PR1r/P3k2p/KpP1N2P/3PB3/8/8/8 w - - 0 1)

van Dijk, Johannes

Noord-Hollandsch Dagblad, 1926

4qB2/R3PR1r/P3k2p/KpP1N2P/3PB3/8/8/8

#2

11 + 5

6490 yacpdb 2020

SOLUTION

  • SOUND
  • Sets
    • 1...Qxe7
      • 2.Raxe7#
    • 1...Qd8+
      • 2.exd8S#
    • 1...Qxf8
      • 2.exf8S#
  • Tries
    • 1.Rd7?
      • threat
        • 2.Bd5#
        • 2.Bf5#
        • 2.Rd6#
      • 1...Qd8+
        • 2.exd8S#
      • 1...Qxf7
        • 2.Rd6#
      • 1...Qxe7
        • 2.Bd5#
        • 2.Bf5#
        • 2.Rdxe7#
      • 1...Rxf7
        • 2.Rd6#
      • 1...Qa8
        • 2.Bf5#
        • 2.Rd6#
      • 1...Qb8
        • 2.Bd5#
        • 2.Bf5#
      • 1...Qxd7!
  • Keys
    • 1.Sg4!
      • threat
        • 2.Rf6#
      • 1...Qd8+
        • 2.exd8S#
      • 1...Kxf7
        • 2.Bd5#
      • 1...Qxf7
        • 2.d5#
      • 1...Qxe7
        • 2.Raxe7#
      • 1...Qxf8
        • 2.exf8S#
      • 1...Rxf7
        • 2.d5#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 0
  • Sets
    • Q(e);OGATE,XP(I)::R1(H),XQ(e)
    • Q(e);CHECK,OGATE::PXQ(e)=S
    • Q(e);OGATE,XB(K)::PXQ(e)=S
  • Tries
    • Try
      • R(H);
      • Threat
        • DUALS(3)
      • Vars
        • Q(e);CHECK,OGATE::PXQ(e)=S
        • Q(e);XR(J)::R1(H)
        • R(d);XR(J)::R1(H)
      • Refutation
        • Q(e);XR(H)
  • Actual
    • S(E);
    • Threat
      • R1(J)
    • Vars
      • Q(e);CHECK,OGATE::PXQ(e)=S
      • K(b);S_FLIGHT,XR(J)::B(B)
      • Q(e);SBLOCK,XR(J)::P(A)
      • Q(e);OGATE,XP(I)::R1(H),XQ(e)
      • Q(e);OGATE,XB(K)::PXQ(e)=S
      • R(d);SBLOCK,XR(J)::P(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).