MESON Chess Problem Database

Problem Display
PID: 91883 (BBn4q/p3p3/2P1P3/R1Pk1P1p/7R/NP2P2K/1r2p3/Q3r3 w - - 0 1)

Gockel, Hubert

Deutsche Schachblatter, 1986

BBn4q/p3p3/2P1P3/R1Pk1P1p/7R/NP2P2K/1r2p3/Q3r3

#2

13 + 9

6490 yacpdb 2009

SOLUTION

  • SOUND
  • Sets
    • 1...Qd4
      • 2.Rxd4#
    • 1...Qe5
      • 2.c7#
    • 1...Qh6
      • 2.Rd4#
    • 1...Qh7
      • 2.Rd4#
    • 1...Qd8
      • 2.Rd4#
    • 1...Qe8
      • 2.Rd4#
    • 1...Qf8
      • 2.Rd4#
    • 1...Qg8
      • 2.Rd4#
    • 1...Rh1+
      • 2.Qxh1#
    • 1...Rb1
      • 2.e4#
      • 2.c7#
    • 1...Ra2
      • 2.e4#
      • 2.c7#
    • 1...Rc2
      • 2.e4#
      • 2.c7#
    • 1...Rd2
      • 2.e4#
      • 2.c7#
    • 1...Sb6
      • 2.cxb6#
    • 1...Sd6
      • 2.cxd6#
  • Tries
    • 1.Sc4?
      • threat
        • 2.c7#
      • 1...Rh1+
        • 2.Qxh1#
      • 1...Qe8
        • 2.Rd4#
      • 1...Sb6
        • 2.cxb6#
      • 1...Sd6
        • 2.cxd6#
      • 1...Rxb3!
    • 1.Bh2?
      • threat
        • 2.c7#
      • 1...Qe8
        • 2.Rd4#
      • 1...Sb6
        • 2.cxb6#
      • 1...Sd6
        • 2.cxd6#
      • 1...Rxb3!
    • 1.Rb4?
      • threat
        • 2.e4#
      • 1...Rh1+
        • 2.Qxh1#
      • 1...Rxb3
        • 2.c7#
      • 1...Qd4
        • 2.Rxd4#
      • 1...Sd6
        • 2.cxd6#
      • 1...Qe5
        • 2.c7#
      • 1...Qc3!
  • Keys
    • 1.Bg3!
      • threat
        • 2.c7#
      • 1...Rh1+
        • 2.Qxh1#
      • 1...Rxb3
        • 2.e4#
      • 1...Qe8
        • 2.Rd4#
      • 1...Sb6
        • 2.cxb6#
      • 1...Sd6
        • 2.cxd6#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 1
    • REMOVED MATES = 7
  • Sets
    • Q(i);N_GUARD::R1(F),XQ(i)
    • Q(i);SBLOCK::B(L)+P(J)
    • Q(i);N_GUARD::R1(F)
    • R(a);CHECK,OGATE::QAB(A),XR(a)
    • S(h);OGATE::R(G)+P(H),XS(h)
  • Tries
    • Try
      • S(B);
      • Threat
        • B(L)+P(J)
      • Vars
        • R(a);CHECK,OGATE::QAB(A),XR(a)
        • Q(i);N_GUARD::R1(F)
        • S(h);OGATE::R(G)+P(H),XS(h)
      • Refutation
        • R(b);P_PINP(D),XP(C)
    • Try
      • B(M);
      • Threat
        • B(L)+P(J)
      • Vars
        • Q(i);N_GUARD::R1(F)
        • S(h);OGATE::R(G)+P(H),XS(h)
      • Refutation
        • R(b);P_PINP(D),XP(C)
    • Try
      • R(F);
      • Threat
        • P(D)
      • Vars
        • R(a);CHECK,OGATE::QAB(A),XR(a)
        • R(b);P_PINP(D),XP(C)::B(L)+P(J)
        • Q(i);N_GUARD::R1(F),XQ(i)
        • S(h);OGATE::R(G)+P(H),XS(h)
        • Q(i);SBLOCK::B(L)+P(J)
      • Refutation
        • Q(i);P_PINP(D)
  • Actual
    • B(M);
    • Threat
      • B(L)+P(J)
    • Vars
      • R(a);CHECK,OGATE::QAB(A),XR(a)
      • R(b);XP(C)::P(D)
      • Q(i);N_GUARD::R1(F)
      • S(h);OGATE::R(G)+P(H),XS(h)
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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).