MESON Chess Problem Database

Problem Display
PID: 275062 (2K3b1/8/3pp1p1/1Q6/R2Pk2N/4p1bR/2P1Np2/3n3n w - - 0 1)

Matrenin, Mikhail Vasilevich

Mat, 1980

2K3b1/8/3pp1p1/1Q6/R2Pk2N/4p1bR/2P1Np2/3n3n

#2

8 + 10

SOLUTION

  • SOUND
  • Sets
    • 1...Be5
      • 2.dxe5#
    • 1...d5
      • 2.Qd3#
    • 1...e5
      • 2.d5#
  • Tries
    • 1.Qg5?
      • threat
        • 2.d5#
      • 1...Be5
        • 2.Qg2#
      • 1...Sb2
        • 2.Sc3#
      • 1...Sc3
        • 2.Sxc3#
      • 1...d5
        • 2.Qxg6#
      • 1...e5!
    • 1.Qh5?
      • threat
        • 2.Qf3#
        • 2.d5#
      • 1...Be5
        • 2.Qf3#
      • 1...e5
        • 2.Qf3#
      • 1...g5
        • 2.Qf3#
      • 1...f1Q
        • 2.d5#
      • 1...f1R
        • 2.d5#
      • 1...Sb2
        • 2.Qf3#
      • 1...Sc3
        • 2.Qf3#
      • 1...d5
        • 2.Qf3#
        • 2.Qxg6#
      • 1...gxh5!
  • Keys
    • 1.Qb1!
      • threat
        • 2.c4#
      • 1...Kd5
        • 2.Qb7#
      • 1...Sb2
        • 2.Qxh1#
      • 1...Sc3
        • 2.Qxh1#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 3
  • Sets
    • B(e);OGATE::R(D)+P(E),XB(e)
    • P(g);SBLOCK::QAB1(G)
    • P(h);SBLOCK::R(D)+P(E)
  • Tries
    • Try
      • Q(G);
      • Threat
        • R(D)+P(E)
      • Vars
        • B(e);OGATE::QAB(G)
        • S(a);N_GUARD::S(B)
        • S(a);N_GUARD::S(B),XS(a)
        • P(g);SBLOCK::QAB(G),XP(i)
      • Refutation
        • P(h);
    • Try
      • Q(G);
      • Threat
        • DUALS(2)
      • Vars
        • B(e);::QAB1(G)
        • P(h);::QAB1(G)
        • P(i);::QAB1(G)
        • P(c);::R(D)+P(E)
        • S(a);::QAB1(G)
      • Refutation
        • P(i);XQ(G)
  • Actual
    • Q(G);
    • Threat
      • QAB(G)+P(A)
    • Vars
      • K(f);S_CUTP(g),S_FLIGHT::QAB(G)
      • S(a);OGATE::QAB(G),XS(b)
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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).