MESON Chess Problem Database

Problem Display
PID: 252379 (2qr2n1/1pp2N2/4P1R1/pP3k1P/K7/1B2PP2/Q1Np4/2bb4 w - - 0 1)

Jordan, Gijsbertus

Schackvarlden, 1940

2qr2n1/1pp2N2/4P1R1/pP3k1P/K7/1B2PP2/Q1Np4/2bb4

#2

11 + 10

15601 Albrecht-Leiss-Degener Collection 2021

SOLUTION

  • SOUND
  • Sets
    • 1...Qxe6
      • 2.Bxe6#
    • 1...Rd4+
      • 2.Sxd4#
    • 1...Re8
      • 2.Sd4#
    • 1...Rf8
      • 2.Sd4#
    • 1...Sf6
      • 2.Rg5#
  • Tries
    • 1.Qb1?
      • threat
        • 2.Sd4#
      • 1...Rd4+
        • 2.Sxd4#
      • 1...Bxc2!
  • Keys
    • 1.Bd5!
      • threat
        • 2.Be4#
      • 1...Bxc2+
        • 2.Qxc2#
      • 1...Qxe6
        • 2.Bxe6#
      • 1...Rxd5
        • 2.Qxd5#
      • 1...Bxf3
        • 2.Sd4#
      • 1...Sf6
        • 2.Rg5#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 3
  • Sets
    • Q(h);OGATE,XP(I)::B(C),XQ(h)
    • R(i);CHECK,N_GUARD::S(B),XR(i)
    • R(i);N_GUARD::S(B)
    • S(j);SBLOCK::R1(J)
  • Tries
    • Try
      • Q(A);
      • Threat
        • QAB(A)+S(B),DCHECK
      • Vars
        • R(i);CHECK::QAB(A)+S(B),DCHECK,XR(i)
      • Refutation
        • B(b);P_PINB(C),P_SPINB(b),XS(B)
  • Actual
    • B(C);P_SPINS(B)
    • Threat
      • B(C)
    • Vars
      • B(b);CHECK,OGATE,XS(B)::QAB(A),XB(b)
      • Q(h);OGATE,XP(I)::B(C),XQ(h)
      • R(i);OGATE,XB(C)::QAR2(A),XR(i)
      • B(b);N_PINS(B),XP(E)::S(B)
      • S(j);SBLOCK::R1(J)
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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).