MESON Chess Problem Database

Problem Display
PID: 261945 (3b4/3p4/p2Q4/r3PK2/3P2Np/nP1kPN2/1P6/1n1B4 w - - 0 1)

Jonsson, Nils Gustav Helmer

1st Prize, Problemnoter, 1957

3b4/3p4/p2Q4/r3PK2/3P2Np/nP1kPN2/1P6/1n1B4

#2

10 + 8

6490 yacpdb 2022

SOLUTION

  • SOUND
  • Sets
    • 1...Rc5
      • 2.dxc5#
    • 1...Rxe5+
      • 2.dxe5#
    • 1...Sd2
      • 2.Se1#
  • Tries
    • 1.Kf4?
      • threat
        • 2.Sf2#
        • 2.Qg6#
      • 1...Rxe5
        • 2.Sf2#
        • 2.Sgxe5#
        • 2.dxe5#
      • 1...Bf6
        • 2.Sf2#
      • 1...Sd2
        • 2.Se1#
        • 2.Sf2#
      • 1...Sc3
        • 2.Sf2#
      • 1...Bg5+!
    • 1.Qg6?
      • threat
        • 2.Kf4#
      • 1...Rxe5+
        • 2.Kxe5#
      • 1...Bg5
        • 2.Kxg5#
      • 1...Sd2
        • 2.Se1#
      • 1...Sc3!
    • 1.Qh6?
      • threat
        • 2.Sf2#
      • 1...Rxe5+
        • 2.Sgxe5#
      • 1...Bg5!
  • Keys
    • 1.Qb4!
      • threat
        • 2.Se1#
      • 1...Rxe5+
        • 2.Sfxe5#
      • 1...Sc3
        • 2.Qxc3#
      • 1...Sc2
        • 2.Qc4#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 1
    • ADDED MATES = 2
    • REMOVED MATES = 2
  • Sets
    • R(e);OGATE::QAR(J)+P(F),XR(e)
    • R(e);CHECK,OGATE,XP(H)::QAR(J)+P(F),XR(e)
    • S(a);SBLOCK::S(E)
  • Tries
    • Try
      • K(I);N_SPINP(H),P-FLIGHT
      • Threat
        • DUALS(2)
      • Vars
        • B(h);::S(G)
        • S(a);::S(G)
      • Refutation
        • B(h);CHECK
    • Try
      • Q(J);
      • Threat
        • QAB(J)+K(I)
      • Vars
        • R(e);CHECK,XP(H)::QAB(J)+K(I),XR(e)
        • B(h);::QAB(J)+K(I),XB(h)
        • S(a);SBLOCK::S(E)
      • Refutation
        • S(a);
    • Try
      • Q(J);
      • Threat
        • S(G)
      • Vars
        • R(e);CHECK,XP(H)::S(G),XR(e)
      • Refutation
        • B(h);
  • Actual
    • Q(J);
    • Threat
      • S(E)
    • Vars
      • R(e);CHECK,XP(H)::S(E),XR(e)
      • S(a);N_GUARD::QAR1(J),XS(a)
      • S(b);N_GUARD::QAB1(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).