MESON Chess Problem Database

Problem Display
PID: 179990 (3b3K/3R1Q1B/r3Nr1R/3PkN2/4P3/2PPP3/p3p3/B4q2 w - - 0 1)

Gross, Erwin

Deutsche Schachzeitung, 1971

3b3K/3R1Q1B/r3Nr1R/3PkN2/4P3/2PPP3/p3p3/B4q2

#2

13 + 7

6490 yacpdb 2018

SOLUTION

  • SOUND
  • Sets
    • 1...Qg2
      • 2.c4#
    • 1...Qh3
      • 2.c4#
    • 1...Qf2
      • 2.c4#
    • 1...Qf3
      • 2.c4#
    • 1...Qf4
      • 2.c4#
      • 2.exf4#
    • 1...Qxf5
      • 2.c4#
    • 1...Ba5
      • 2.Qxf6#
    • 1...Bb6
      • 2.Qxf6#
    • 1...Bc7
      • 2.Qxf6#
    • 1...e1S
      • 2.c4#
  • Tries
    • 1.Sd6?
      • threat
        • 2.Sc4#
        • 2.d4#
      • 1...Rxd6
        • 2.d4#
      • 1...Qd1
        • 2.Sc4#
      • 1...Rc6
        • 2.d4#
      • 1...Bb6
        • 2.Sc4#
      • 1...Ra4!
    • 1.Sg5?
      • threat
        • 2.d4#
      • 1...Qd1
        • 2.Sf3#
      • 1...Bb6
        • 2.Qxf6#
      • 1...Ra4!
  • Keys
    • 1.Se7!
      • threat
        • 2.d4#
      • 1...Ra4
        • 2.Sc6#
      • 1...Qd1
        • 2.Qxf6#
      • 1...Qf5
        • 2.c4#
      • 1...Rf5
        • 2.Sg6#
      • 1...Rg6
        • 2.Sxg6#
      • 1...Bb6
        • 2.Sc6#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 1
    • ADDED MATES = 4
    • REMOVED MATES = 7
  • Sets
    • Q(a);N_GUARD::B(A)+P(B)
    • Q(a);N_GUARD,XS(G)::B(A)+P(B)
    • B(g);N_GUARD::QAB1(K),XR(f)
    • P(c);S_CUTQ(a)::B(A)+P(B)
  • Tries
    • Try
      • S(G);
      • Threat
        • DUALS(2)
      • Vars
        • R(e);XS(G)::P(C)
        • Q(a);::S(G)
        • R(e);::P(C)
        • B(g);::S(G)
      • Refutation
        • R(e);
    • Try
      • S(H);
      • Threat
        • P(C)
      • Vars
        • Q(a);N_GUARD::S(H)
        • B(g);N_GUARD,S_CUTR(e)::QAB1(K),XR(f)
      • Refutation
        • R(e);
  • Actual
    • S(G);
    • Threat
      • P(C)
    • Vars
      • R(e);N_GUARD::S(G)
      • Q(a);N_GUARD::QAB1(K),XR(f)
      • Q(a);N_GUARD::B(A)+P(B)
      • R(f);N_GUARD::S(G)
      • R(f);N_GUARD::S(G),XR(f)
      • B(g);S_CUTR(e)::S(G)
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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).