MESON Chess Problem Database

Problem Display
PID: 261975 (3n4/4QB2/2p3p1/1N2bp1N/rRr1k1P1/p3p3/n3P3/6BK w - - 0 1)

Wirtanen, Erkki Aukusti

1st Prize, Problemnoter, 1959

3n4/4QB2/2p3p1/1N2bp1N/rRr1k1P1/p3p3/n3P3/6BK

#2

9 + 11

6490 yacpdb 2022

SOLUTION

  • SOUND
  • Sets
    • 1...Ra5
      • 2.Rxc4#
    • 1...Ra6
      • 2.Rxc4#
    • 1...Ra7
      • 2.Rxc4#
    • 1...Ra8
      • 2.Rxc4#
    • 1...Rd4
      • 2.Sd6#
    • 1...f4
      • 2.Sf6#
  • Tries
    • 1.Bh2?
      • threat
        • 2.Sf6#
        • 2.Qxe5#
      • 1...Sxf7
        • 2.Sf6#
      • 1...fxg4
        • 2.Qxe5#
      • 1...cxb5
        • 2.Qxe5#
      • 1...gxh5
        • 2.Qxe5#
      • 1...f4
        • 2.Sf6#
      • 1...Se6!
  • Keys
    • 1.Qc5!
      • threat
        • 2.Qxe3#
      • 1...Sxf7
        • 2.Qxc6#
      • 1...fxg4
        • 2.Bxg6#
      • 1...Rd4
        • 2.Qc2#
      • 1...Bd4
        • 2.Sd6#
      • 1...Bf4
        • 2.Sf6#
      • 1...Se6
        • 2.Qxc6#
      • 1...f4
        • 2.Bxg6#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 2
    • ADDED MATES = 5
    • REMOVED MATES = 4
  • Sets
    • R(d);N_GUARD::R(D),XR(e)
    • R(e);::S(F)
    • P(h);SBLOCK::S(G)
  • Tries
    • Try
      • B(A);
      • Threat
        • DUALS(2)
      • Vars
        • S(k);XB(I)::S(G)
        • P(h);XP(E)::QAR1(H),XB(g)
        • P(i);XS(F)::QAR1(H),XB(g)
        • P(j);XS(G)::QAR1(H),XB(g)
        • P(h);::S(G)
      • Refutation
        • S(k);N_SPINB(g)
  • Actual
    • Q(H);N_PINB(g)
    • Threat
      • QAR1(H),XP(c)
    • Vars
      • S(k);N_GUARD,XB(I)::QAB(H),XP(i)
      • P(h);OGATEB,XP(E)::B(I),XP(j)
      • R(e);OGATE::QAB(H)
      • B(g);N_GUARD,N_SPINR(e)::S(F)
      • B(g);N_GUARD,SBLOCK::S(G)
      • S(k);N_GUARD::QAB(H),XP(i)
      • P(h);OGATEB::B(I),XP(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).