MESON Chess Problem Database

Problem Display
PID: 262438 (3Q1B2/nP1B1n1N/1P1P3r/Rp1k1p2/8/bKpNPP2/8/8 w - - 0 1)

Spiess, Jean-Yves

Europe Echecs, 1978

3Q1B2/nP1B1n1N/1P1P3r/Rp1k1p2/8/bKpNPP2/8/8

#2

12 + 8

6490 yacpdb 2022

SOLUTION

  • SOUND
  • Sets
    • 1...Rh1
      • 2.Sf6#
    • 1...Rh2
      • 2.Sf6#
    • 1...Rh3
      • 2.Sf6#
    • 1...Rh4
      • 2.Sf6#
    • 1...Rh5
      • 2.Sf6#
    • 1...Rf6
      • 2.Sxf6#
  • Tries
    • 1.Rxb5+?
      • 1...Bc5
        • 2.Rxc5#
      • 1...Sxb5!
    • 1.Qc7?
      • threat
        • 2.Qc4#
      • 1...Rh4
        • 2.Sf6#
      • 1...Bc5
        • 2.Qxc5#
      • 1...Sc6
        • 2.Qxc6#
      • 1...Se5
        • 2.Sf4#
      • 1...Sxd6!
  • Keys
    • 1.Qf6!
      • threat
        • 2.Qd4#
      • 1...Rxf6
        • 2.Sxf6#
      • 1...Rh4
        • 2.Qe6#
        • 2.Qxf7#
      • 1...Bc5
        • 2.Sf4#
      • 1...Sc6
        • 2.Be6#
      • 1...Se5
        • 2.Qxe5#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 5
  • Sets
    • R(f);N_GUARD::S(J)
    • R(f);N_GUARD::S(J),XR(f)
  • Tries
    • Try
      • R(E);CHECK,XP(c)
      • Vars
        • B(a);N_GUARD,P_SPINB(a)::R1(E),XB(a)
      • Refutation
        • S(g);XR(E)
    • Try
      • Q(K);
      • Threat
        • QAB1(K)
      • Vars
        • R(f);N_GUARD::S(J)
        • B(a);N_GUARD,N_SPINP(c)::QAR1(K),XB(a)
        • S(g);N_GUARD::QAB1(K),XS(g)
        • S(h);SBLOCK::S(B)
      • Refutation
        • S(h);XP(G)
  • Actual
    • Q(K);
    • Threat
      • QAR1(K)
    • Vars
      • R(f);XQ(K)::S(J),XR(f)
      • B(a);N_SPINP(c),SBLOCK::S(B)
      • S(g);SBLOCK::B(I)
      • S(h);N_GUARD::QAR1(K),XS(h)
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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).