MESON Chess Problem Database

Problem Display
PID: 90653 (1B1r2Q1/1nr1PP1K/1bbk1Pp1/2pNn2p/1PpP1Np1/3p1p2/4q3/8 w - - 0 1)

ten Cate, Pieter

Die Schwalbe, 1968

1B1r2Q1/1nr1PP1K/1bbk1Pp1/2pNn2p/1PpP1Np1/3p1p2/4q3/8

#2

10 + 15

6490 yacpdb 2009

SOLUTION

  • SOUND
  • Sets
    • 1...Rd7
      • 2.e8S#
  • Tries
    • 1.f8B?
      • threat
        • 2.Qe6#
      • 1...Bxd5
        • 2.Qxd5#
      • 1...Sd7
        • 2.e8S#
      • 1...Bd7
        • 2.exd8S#
      • 1...Sf7
        • 2.exd8Q#
        • 2.exd8R#
      • 1...Kd7!
  • Keys
    • 1.f8Q!
      • threat
        • 2.Qe6#
      • 1...Kd7
        • 2.Qe6#
      • 1...Bxd5
        • 2.Qxd5#
      • 1...Bd7
        • 2.exd8S#
      • 1...Sd7
        • 2.e8S#
      • 1...Sf7
        • 2.exd8Q#
        • 2.exd8R#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 4
    • REMOVED MATES = 1
  • Sets
    • R(o);N_GUARD,SBLOCK,S_CUTB(j)::P=S
  • Tries
    • Try
      • P(G);P_SPINP(F)
      • Threat
        • QAR1(J)
      • Vars
        • B(j);OGATE,XS(D)::QAR1(J),XB(j)
        • S(g);N_PINP(F),SBLOCK::P=S
        • B(j);N_PINP(F),SBLOCK::PXR(o)=S
        • S(g);N_PINP(F)::PXR(o)=Q
      • Refutation
        • K(k);N_PINP(F),N_SPINR(n),P-FLIGHT
  • Actual
    • P(G);P_SPINP(F)
    • Threat
      • QAR1(J)
    • Vars
      • K(k);N_PINP(F),N_SPINR(n),P-FLIGHT::QAB1(J)
      • B(j);OGATE,XS(D)::QAR1(J),XB(j)
      • B(j);N_PINP(F),SBLOCK::PXR(o)=S
      • S(g);N_PINP(F),SBLOCK::P=S
      • S(g);N_PINP(F)::PXR(o)=Q
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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).