MESON Chess Problem Database

Problem Display
PID: 164760 (5Q2/3B4/1P3p2/Br1n3p/k3q1Rr/PNP1p3/1K5p/8 w - - 0 1)

Persson, Lars Holger

Norsk Sjakkblad, 1934

5Q2/3B4/1P3p2/Br1n3p/k3q1Rr/PNP1p3/1K5p/8

#2

9 + 9

15148 Sadier Collection 2017

SOLUTION

  • SOUND
  • Tries
    • 1.Rxe4+?
      • 1...Sb4
        • 2.Qxb4#
      • 1...Rxe4!
    • 1.Qe8?
      • threat
        • 2.Bxb5#
      • 1...Sc7
        • 2.Qxe4#
      • 1...Sxc3!
  • Keys
    • 1.Qa8!
      • threat
        • 2.Bb4#
      • 1...Sxc3
        • 2.Bxc3#
      • 1...Sxb6
        • 2.Bxb6#
      • 1...Qb4
        • 2.Bxb4#
      • 1...Sb4
        • 2.Sc5#
      • 1...Sf4
        • 2.Qxe4#
      • 1...Sc7
        • 2.Qxe4#
      • 1...Se7
        • 2.Qxe4#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 7
    • REMOVED MATES = 0
  • Sets
  • Tries
    • Try
      • R(E);CHECK,XQ(d)
      • Vars
        • S(g);N_GUARD,N_PINS(C),P_SPINS(g)::QAR1(I),XS(g)
      • Refutation
        • R(e);XR(E)
    • Try
      • Q(I);
      • Threat
        • B(H),XR(f)
      • Vars
        • S(g);N_GUARD::QAR(I),XQ(d)
      • Refutation
        • S(g);XP(D)
  • Actual
    • Q(I);
    • Threat
      • QAR(I)+B(F)
    • Vars
      • S(g);OGATE,XP(D)::QAR(I)+B(F),XS(g)
      • S(g);OGATE,XP(G)::QAR(I)+B(F),XS(g)
      • Q(d);::QAR(I)+B(F),XQ(d)
      • S(g);N_PINS(C),N_SPINQ(d)::S(C)
      • S(g);N_SPINQ(d),OGATE::QAR(I),XQ(d)
      • S(g);OGATE::QAR(I),XQ(d)
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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).