MESON Chess Problem Database

Problem Display
PID: 169811 (Kb6/3Q1N2/4N2B/R2P3R/2p1k1B1/2Pn4/2P2r2/3rq1n1 w - - 0 1)

Jonsson, Nils Gustav Helmer

3rd Prize, Upsala Schacksallskap, 1945

Kb6/3Q1N2/4N2B/R2P3R/2p1k1B1/2Pn4/2P2r2/3rq1n1

#2

11 + 8

6490 yacpdb 2018

SOLUTION

  • SOUND
  • Sets
    • 1...Bd6
      • 2.Sxd6#
    • 1...Ba7
      • 2.Sd6#
    • 1...Sf3
      • 2.Bf5#
    • 1...Sc1
      • 2.Sc5#
    • 1...Sb2
      • 2.Sc5#
    • 1...Sb4
      • 2.Sc5#
    • 1...Sc5
      • 2.Sxc5#
    • 1...Se5
      • 2.Sc5#
  • Tries
    • 1.Re5+?
      • 1...Sxe5
        • 2.Sc5#
      • 1...Bxe5!
    • 1.cxd3+?
      • 1...Rxd3
        • 2.Sc5#
      • 1...cxd3
        • 2.Sc5#
        • 2.Ra4#
        • 2.Qa4#
      • 1...Kxd3!
  • Keys
    • 1.Qa7!
      • threat
        • 2.Qd4#
      • 1...Qxc3
        • 2.Qe3#
      • 1...Bxa7
        • 2.Sd6#
      • 1...Qe3
        • 2.Qxe3#
      • 1...Be5
        • 2.Sfg5#
      • 1...Se2
        • 2.Qe3#
      • 1...Sf3
        • 2.Bf5#
      • 1...Sc1
        • 2.Sc5#
      • 1...Sb2
        • 2.Sc5#
      • 1...Sb4
        • 2.Sc5#
      • 1...Sf4
        • 2.Seg5#
      • 1...Sc5
        • 2.Sxc5#
      • 1...Se5
        • 2.Sfg5#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 1
    • ADDED MATES = 5
    • REMOVED MATES = 1
  • Sets
    • B(h);N_GUARD::S(J),XB(h)
    • B(h);N_GUARD::S(J)
    • S(c);SBLOCK,S_CUTR(d)::B(C)
    • S(e);N_GUARD::S(G)
    • S(e);N_GUARD::S(G),XS(e)
  • Tries
    • Try
      • R(F);CHECK
      • Vars
        • S(e);XR(F)::S(G)
      • Refutation
        • B(h);XR(F)
    • Try
      • P(A);CHECK,XS(e)
      • Vars
        • R(a);XP(A)::S(G)
      • Refutation
        • K(g);S_FLIGHT,XP(A)
  • Actual
    • Q(I);
    • Threat
      • QAR1(I)
    • Vars
      • Q(b);N_GUARD,XP(B)::QAR1(I)
      • B(h);N_GUARD,XQ(I)::S(J)
      • Q(b);N_GUARD::QAR1(I),XQ(b)
      • B(h);SBLOCK::S(J)
      • S(c);S_CUTQ(b)::QAR1(I)
      • S(c);SBLOCK,S_CUTR(d)::B(C)
      • S(e);N_GUARD::S(G)
      • S(e);SBLOCK::S(G)
      • S(e);N_GUARD::S(G),XS(e)
      • S(e);SBLOCK::S(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).