MESON Chess Problem Database

Problem Display
PID: 125522 (3b1Bb1/2p1r1P1/R3NkP1/3Qpq2/2KP3N/3p1P2/8/5R2 w - - 0 1)

Eriksson, Finn Olof

Vart Hem, 1936

3b1Bb1/2p1r1P1/R3NkP1/3Qpq2/2KP3N/3p1P2/8/5R2

#2

11 + 8

6490 yacpdb 2009
5454 Near Snap 2010

SOLUTION

  • SOUND
  • Sets
    • 1...Qh3
      • 2.Qxe5#
      • 2.dxe5#
    • 1...Qe4
      • 2.fxe4#
    • 1...Qg4
      • 2.Qxe5#
      • 2.fxg4#
    • 1...Qxf3
      • 2.Rxf3#
      • 2.Qxf3#
      • 2.Qxe5#
      • 2.dxe5#
    • 1...Rxe6
      • 2.Qxd8#
    • 1...exd4
      • 2.Qxf5#
    • 1...e4
      • 2.Qxf5#
  • Tries
    • 1.Bxe7+?
      • 1...Kxe7
        • 2.Qxd8#
      • 1...Bxe7!
  • Keys
    • 1.f4!
      • threat
        • 2.fxe5#
      • 1...Qxe6
        • 2.dxe5#
      • 1...Qxf4
        • 2.Qxe5#
      • 1...Rxe6
        • 2.Qxd8#
      • 1...Bxe6
        • 2.g8S#
      • 1...exd4
        • 2.Qxf5#
      • 1...exf4
        • 2.Qxf5#
      • 1...e4
        • 2.Qxf5#

This anticipates 136223(1962-1963)

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 4
    • REMOVED MATES = 1
  • Sets
    • Q(c);OGATE,P_PINP(D)::R(A)+P(B),XQ(c)
    • R(f);OGATEB,P_SPINR(f),XS(H)::QAB(F),XB(g)
    • P(b);OGATE,XP(D)::QAR1(F),XQ(c)
    • P(b);OGATE::QAR1(F),XQ(c)
  • Tries
    • Try
      • B(K);CHECK,XR(f)
      • Vars
        • K(d);S_FLIGHT,XB(K)::QAB1(F),XB(g)
      • Refutation
        • B(g);XB(K)
  • Actual
    • P(B);
    • Threat
      • P(B),XP(b)
    • Vars
      • Q(c);N_GUARD,P_PINQ(F),P_SPINQ(c),XS(H)::P(D),XP(b)
      • Q(c);N_GUARD,P_PINP(D),P_SPINQ(c),XP(B)::QAB1(F),XP(b)
      • R(f);OGATEB,P_SPINR(f),XS(H)::QAB(F),XB(g)
      • B(h);OGATE,P_PINQ(F),P_SPINB(h),XS(H)::P=S
      • P(b);OGATE,XP(D)::QAR1(F),XQ(c)
      • P(b);OGATE,XP(B)::QAR1(F),XQ(c)
      • P(b);OGATE::QAR1(F),XQ(c)
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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).