MESON Chess Problem Database

Problem Display
PID: 261546 (8/3K4/1Q2Pp2/R1N1R1n1/1P1kn1N1/1Pp2p1b/3rr3/5B2 w - - 0 1)

Ascher, Valeska

Neue Zurcher Zeitung, 1957

8/3K4/1Q2Pp2/R1N1R1n1/1P1kn1N1/1Pp2p1b/3rr3/5B2

#2

10 + 9

6490 yacpdb 2022

SOLUTION

  • SOUND
  • Sets
    • 1...Rd3
      • 2.Sxe4#
    • 1...Re1
      • 2.Sxe4#
    • 1...Rf2
      • 2.Sxe4#
    • 1...Rg2
      • 2.Sxe4#
    • 1...Rh2
      • 2.Sxe4#
    • 1...Re3
      • 2.Sxe4#
    • 1...Sf2
      • 2.Qd6#
    • 1...Sg3
      • 2.Qd6#
    • 1...Sd6
      • 2.Qxd6#
  • Tries
    • 1.Rxe4+?
      • 1...Kd5
        • 2.Sxf6#
        • 2.Qc6#
        • 2.Qd6#
        • 2.Qb7#
      • 1...Rxe4
        • 2.Sd3#
        • 2.Sa4#
        • 2.Sa6#
        • 2.Sb7#
        • 2.Qd6#
      • 1...Sxe4!
  • Keys
    • 1.Sf2!
      • threat
        • 2.Scxe4#
      • 1...Ke3+
        • 2.Scd3#
      • 1...Kxe5+
        • 2.Scd3#
      • 1...Bxe6+
        • 2.Sxe6#
      • 1...Sxc5+
        • 2.Qxc5#
      • 1...Sxf2
        • 2.Qd6#
      • 1...Sxe6
        • 2.Sxe6#
      • 1...Sg3
        • 2.Scd3#
        • 2.Sa4#
        • 2.Sce4#
        • 2.Sa6#
        • 2.Sb7#
        • 2.Qd6#
      • 1...Sd6
        • 2.Scd3#
        • 2.Sa4#
        • 2.Sce4#
        • 2.Sa6#
        • 2.Sb7#
        • 2.Qxd6#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 5
    • REMOVED MATES = 8
  • Sets
    • R(a);SBLOCK::QAB(H)+S(F),XS(g)
    • R(b);::QAB(H)+S(F),XS(g)
    • S(g);N_GUARD::QAR2(H)
    • S(g);N_GUARD::QAR2(H),XS(g)
  • Tries
    • Try
      • R(G);CHECK,XS(g)
      • Refutation
        • S(h);XR(G)
  • Actual
    • S(D);P_SPINP(I)
    • Threat
      • QAB(H)+S(F),XS(g)
    • Vars
      • K(f);CHECK,P_SPINS(g),S_FLIGHT::QAB(H)+S(F)
      • K(f);CHECK,S_FLIGHT,XR(G)::R(E)+S(F),DCHECK
      • B(e);CHECK,XP(I)::QAB(H)+S(F),DCHECK,XB(e)
      • S(g);CHECK,OGATE,P_SPINS(g),XS(F)::QAB1(H),XS(g)
      • S(g);N_GUARD,XS(D)::QAR2(H)
      • S(h);XP(I)::QAB(H)+S(F),DCHECK,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).