MESON Chess Problem Database

Problem Display
PID: 177980 (2Q5/5N1B/1p1N1Pr1/bP1k2p1/r1pp3n/1p4K1/2nR4/8 w - - 0 1)

Leun, Evgeny

Sahs (Latvia), 1986

2Q5/5N1B/1p1N1Pr1/bP1k2p1/r1pp3n/1p4K1/2nR4/8

#2

8 + 11

6490 yacpdb 2018

SOLUTION

  • SOUND
  • Sets
    • 1...Ra1
      • 2.Qxc4#
    • 1...Ra2
      • 2.Qxc4#
    • 1...Ra3
      • 2.Qxc4#
    • 1...Rxf6
      • 2.Be4#
    • 1...Rh6
      • 2.Be4#
    • 1...Rg7
      • 2.Be4#
    • 1...Rg8
      • 2.Be4#
    • 1...Bb4
      • 2.Qxc4#
    • 1...Sb4
      • 2.Qxc4#
    • 1...Sg2
      • 2.Qf5#
    • 1...Sf5+
      • 2.Qxf5#
  • Tries
    • 1.Se4?
      • threat
        • 2.Qc6#
      • 1...Sf5+
        • 2.Qxf5#
      • 1...Kxe4
        • 2.Qe6#
      • 1...Rxf6
        • 2.Sxf6#
      • 1...Sb4
        • 2.Sc3#
      • 1...d3!
  • Keys
    • 1.Sf5!
      • threat
        • 2.Qc6#
      • 1...Sxf5+
        • 2.Qxf5#
      • 1...Ke4
        • 2.Qe6#
      • 1...Rxf6
        • 2.Se7#
      • 1...Sb4
        • 2.Rxd4#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 2
    • ADDED MATES = 1
    • REMOVED MATES = 8
  • Sets
    • R(c);N_GUARD::QAB1(H),XP(d)
    • R(k);OGATE,XP(E)::B(G)
    • R(k);OGATE::B(G)
    • B(g);S_CUTR(c)::QAB1(H),XP(d)
    • S(a);S_CUTR(c)::QAB1(H),XP(d)
    • S(f);N_GUARD::QAR2(H)
    • S(f);CHECK,N_GUARD::QAR2(H),XS(f)
  • Tries
    • Try
      • S(D);
      • Threat
        • QAB1(H)
      • Vars
        • S(f);CHECK,N_GUARD::QAR2(H),XS(f)
        • K(h);N_SPINP(e),P_SPINR(k),S_FLIGHT,XS(D)::QAR2(H)
        • R(k);XP(E)::S(D),XR(k)
        • S(a);S_CUTB(g)::S(D)
      • Refutation
        • P(e);
  • Actual
    • S(D);
    • Threat
      • QAB1(H)
    • Vars
      • S(f);CHECK,OGATE,XS(D)::QAR2(H),XS(f)
      • K(h);N_SPINP(e),S_FLIGHT::QAR2(H)
      • R(k);XP(E)::S(D)
      • S(a);N_GUARD::R1(A),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).