MESON Chess Problem Database

Problem Display
PID: 221886 (2n5/2nK1N1B/1brp4/Rppk1N2/6pR/B2P3b/P5Pr/3Q4 w - - 0 1)

Hjelle, David

Suomen Shakki, 1952

2n5/2nK1N1B/1brp4/Rppk1N2/6pR/B2P3b/P5Pr/3Q4

#2

11 + 11

15148 Sadier Collection 2020

SOLUTION

  • SOUND
  • Sets
    • 1...g3
      • 2.Qf3#
    • 1...b4
      • 2.Qb3#
  • Tries
    • 1.Bb2?
      • threat
        • 2.Se3#
      • 1...g3
        • 2.Qf3#
      • 1...c4!
    • 1.Rxg4?
      • threat
        • 2.Se3#
        • 2.Qf3#
      • 1...Bxg2
        • 2.Se3#
      • 1...c4
        • 2.Qf3#
        • 2.dxc4#
      • 1...Bxg4!
    • 1.Qxg4?
      • threat
        • 2.Se3#
        • 2.Qf3#
        • 2.Qe4#
      • 1...Bxg2
        • 2.Se3#
      • 1...c4
        • 2.Qf3#
        • 2.Qe4#
      • 1...Bxg4!
  • Keys
    • 1.d4!
      • threat
        • 2.Se3#
      • 1...Kc4
        • 2.Qb3#
      • 1...Ke4
        • 2.Qf3#
      • 1...g3
        • 2.dxc5#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 1
    • ADDED MATES = 2
    • REMOVED MATES = 1
  • Sets
    • P(c);N_GUARD,P_PINS(H)::QAB(A)
    • P(d);P_SPINP(e)::QAB(A)
  • Tries
    • Try
      • B(D);
      • Threat
        • S(H)
      • Vars
        • P(c);N_GUARD,P_PINS(H)::QAB(A)
      • Refutation
        • P(e);P_SPINP(d)
    • Try
      • R(F);XP(c)
      • Threat
        • DUALS(2)
      • Vars
        • B(b);XP(C)::S(H)
      • Refutation
        • B(b);P_PINS(H),XR(F)
    • Try
      • Q(A);XP(c)
      • Threat
        • DUALS(3)
      • Vars
        • B(b);XP(C)::S(H)
      • Refutation
        • B(b);P_PINS(H),XQ(A)
  • Actual
    • P(E);
    • Threat
      • S(H)
    • Vars
      • K(f);S_FLIGHT::QAB1(A)
      • K(f);P_SPINP(c),S_FLIGHT::QAB1(A)
      • P(c);P_PINS(H)::QAR(A)+P(E),XP(e)
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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).