MESON Chess Problem Database

Problem Display
PID: 82269 (B3r3/p1p1R1p1/K1N4q/p7/r1R3p1/5k1p/3Bp1b1/2n1Q3 w - - 0 1)

Ahues, Herbert Siegfried Oskar

Scacco!, 1984

B3r3/p1p1R1p1/K1N4q/p7/r1R3p1/5k1p/3Bp1b1/2n1Q3

#2

7 + 13

6490 yacpdb 2009

SOLUTION

  • SOUND
  • Sets
    • 1...Qe3
      • 2.Se5#
    • 1...Qf4
      • 2.Sd4#
      • 2.Se5#
    • 1...Qg5
      • 2.Sd4#
      • 2.Se5#
    • 1...Qh4
      • 2.Sd4#
      • 2.Se5#
    • 1...Qh5
      • 2.Sd4#
      • 2.Se5#
    • 1...Qxc6+
      • 2.Bxc6#
    • 1...Qh7
      • 2.Sd4#
      • 2.Se5#
    • 1...Qh8
      • 2.Sd4#
      • 2.Se5#
      • 2.Rf7#
    • 1...g6
      • 2.Sd4#
      • 2.Se5#
  • Tries
    • 1.Rf4+?
      • 1...Qxf4
        • 2.Sd4#
        • 2.Se5#
      • 1...Rxf4!
    • 1.Re3+?
      • 1...Qxe3
        • 2.Se5#
      • 1...Rxe3!
    • 1.Rf7+?
      • 1...Qf4
        • 2.Sd4#
        • 2.Se5#
        • 2.Rfxf4#
      • 1...Qf6!
  • Keys
    • 1.Bf4!
      • threat
        • 2.Qg3#
      • 1...Qxc6+
        • 2.Bxc6#
      • 1...Qxf4
        • 2.Sd4#
      • 1...g3
        • 2.Qxg3#
      • 1...Qh4
        • 2.Se5#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 1
  • Sets
    • Q(i);N_PINS(E)::B(G)+S(E),DCHECK
    • Q(i);CHECK,OGATE,P_SPINQ(i),XS(E)::B(G),XQ(i)
  • Tries
    • Try
      • R(C);CHECK
      • Refutation
        • R(f);XR(C)
    • Try
      • R(F);CHECK
      • Vars
        • Q(i);N_PINS(E),XR(F)::B(G)+S(E),DCHECK
      • Refutation
        • R(m);XR(F)
    • Try
      • R(F);CHECK
      • Refutation
        • Q(i);P_SPINQ(i)
  • Actual
    • B(B);
    • Threat
      • QAR1(A)
    • Vars
      • Q(i);CHECK,OGATE,P_SPINQ(i),XS(E)::B(G),XQ(i)
      • Q(i);N_PINS(E),SBLOCK,XB(B)::B(G)+S(E),DCHECK
      • P(g);::QAR1(A),XP(g)
      • Q(i);N_PINS(E)::B(G)+S(E),DCHECK
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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).