MESON Chess Problem Database

Problem Display
PID: 15556 (KQ6/B1p2q2/2P2p2/p2R1R1N/4k1bp/5pp1/1n2PP2/4N3 w - - 0 1)

Keller, Michael

3rd Prize, Schach-Echo, 1985

KQ6/B1p2q2/2P2p2/p2R1R1N/4k1bp/5pp1/1n2PP2/4N3

#2

10 + 10

4655 Michael Keller Ein Meister der Schachkomposition 1994

SOLUTION

  • SOUND
  • Sets
    • 1...Qe8
      • 2.Sxf6#
      • 2.Qxe8#
    • 1...Qg8
      • 2.Sxf6#
    • 1...Qd7
      • 2.Sxf6#
    • 1...Qh7
      • 2.Sxf6#
    • 1...Bh3
      • 2.exf3#
    • 1...Sd1
      • 2.Qb1#
    • 1...Sd3
      • 2.exd3#
    • 1...Sa4
      • 2.Qb1#
    • 1...Sc4
      • 2.Qb1#
    • 1...h3
      • 2.Sxg3#
  • Tries
    • 1.Qb4+?
      • 1...Sc4
        • 2.Qb1#
        • 2.Qxc4#
      • 1...axb4!
    • 1.Qc8?
      • threat
        • 2.Rd4#
      • 1...Qxd5
        • 2.Sxf6#
      • 1...Bxf5
        • 2.Qxf5#
      • 1...Qe6
        • 2.Qxe6#
      • 1...Qd7
        • 2.Sxf6#
      • 1...gxf2!
    • 1.Qd8?
      • threat
        • 2.Rf4#
      • 1...Qxd5
        • 2.Qxd5#
      • 1...Qxh5
        • 2.Qe7#
      • 1...Bxf5
        • 2.exf3#
      • 1...Qd7
        • 2.Sxf6#
      • 1...Sd3
        • 2.exd3#
      • 1...Bxh5!
    • 1.Qe8+?
      • 1...Qe6
        • 2.Sxf6#
        • 2.Qxe6#
      • 1...Qe7
        • 2.Sxf6#
        • 2.Qxe7#
      • 1...Qxe8+!
  • Keys
    • 1.Sxf3!
      • threat
        • 2.Sd2#
      • 1...Qxd5
        • 2.Rf4#
      • 1...Bxf3
        • 2.exf3#
      • 1...Bxf5
        • 2.Rd4#
      • 1...Sc4
        • 2.Qb1#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 8
  • Sets
    • Q(j);N_GUARD,P_PINQ(J)::S(F),XP(h)
    • Q(j);N_GUARD::S(F),XP(h)
    • B(e);N_GUARD::P(B),XP(b)
    • S(a);OGATE::QAB(J)
    • S(a);OGATE::P(B),XS(a)
    • P(f);N_GUARD::S(F),XP(c)
  • Tries
    • Try
      • Q(J);CHECK
      • Refutation
        • P(g);XQ(J)
    • Try
      • Q(J);
      • Threat
        • R1(D)
      • Vars
        • Q(j);N_GUARD,P_PINP(G),XR(D)::S(F),XP(h)
        • B(e);OGATE,XR(E)::QAB1(J),XB(e)
        • Q(j);N_GUARD::QAR2(J),XQ(j)
        • Q(j);N_GUARD::S(F),XP(h)
      • Refutation
        • P(c);XP(C)
    • Try
      • Q(J);
      • Threat
        • R1(E)
      • Vars
        • Q(j);OGATE,P_PINP(G),XR(D)::QAB1(J),XQ(j)
        • Q(j);N_GUARD,XS(F)::QAR(J)
        • B(e);N_GUARD,XR(E)::P(B),XP(b)
        • Q(j);N_GUARD::S(F),XP(h)
        • S(a);OGATE::P(B),XS(a)
      • Refutation
        • B(e);XS(F)
    • Try
      • Q(J);CHECK
      • Refutation
        • Q(j);CHECK,XQ(J)
  • Actual
    • S(A);XP(b)
    • Threat
      • S(A)
    • Vars
      • Q(j);P_PINP(G),SBLOCK,XR(D)::R1(E)
      • B(e);OGATE,XS(A)::P(B),XB(e)
      • B(e);SBLOCK,XR(E)::R1(D)
      • S(a);OGATE::QAB(J)
HTML5 logo

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).