MESON Chess Problem Database

Problem Display
PID: 7572 (5b2/K4p2/2Q5/pppN4/b2kn1N1/r3R2p/B1R1p3/5rnq w - - 0 1)

Keller, Michael

Schweizerische Schachzeitung, 1991

5b2/K4p2/2Q5/pppN4/b2kn1N1/r3R2p/B1R1p3/5rnq

#2

7 + 14

4655 Michael Keller Ein Meister der Schachkomposition 1994
4827 FIDE Album (1989-1991) 1997

SOLUTION

  • SOUND
  • Sets
    • 1...Sf2
      • 2.Qf6#
    • 1...Sc3
      • 2.Rd2#
    • 1...Sd6
      • 2.Qxc5#
    • 1...b4
      • 2.Rc4#
  • Tries
    • 1.Sc3?
      • threat
        • 2.Qd5#
      • 1...Sxc3
        • 2.Rd2#
      • 1...Bb3
        • 2.Sxb5#
      • 1...Sd2
        • 2.Rxd2#
      • 1...Sf2
        • 2.Qf6#
      • 1...Sg3
        • 2.Rd2#
      • 1...Sg5
        • 2.Rd2#
      • 1...Sd6
        • 2.Rd2#
      • 1...Sf6
        • 2.Rd2#
      • 1...Rf5!
    • 1.Se7?
      • threat
        • 2.Qd5#
      • 1...Rf5
        • 2.Sxf5#
      • 1...Sd2
        • 2.Qxc5#
      • 1...Sf2
        • 2.Sf5#
        • 2.Qxc5#
        • 2.Qf6#
      • 1...Sc3
        • 2.Rd2#
      • 1...Sg3
        • 2.Qxc5#
      • 1...Sg5
        • 2.Qxc5#
      • 1...Sd6
        • 2.Qxc5#
      • 1...Sf6
        • 2.Qxc5#
      • 1...Bb3!
    • 1.Rd2+?
      • 1...Rd3
        • 2.Rdxd3#
        • 2.Rexd3#
      • 1...Sxd2!
  • Keys
    • 1.Sf4!
      • threat
        • 2.Qd5#
      • 1...Bb3
        • 2.Rd3#
      • 1...Sd2
        • 2.Qf6#
      • 1...Sf2
        • 2.Qf6#
      • 1...Sc3
        • 2.Rd2#
        • 2.Rd3#
        • 2.Qf6#
      • 1...Sg3
        • 2.Qf6#
      • 1...Sg5
        • 2.Qf6#
      • 1...Sd6
        • 2.Qxc5#
      • 1...Sf6
        • 2.Qxf6#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 5
    • REMOVED MATES = 2
  • Sets
    • S(i);N_GUARD,S_CUTR(a)::QAB(F)
    • S(i);N_GUARD,S_CUTR(e)::R(B)
    • S(i);N_GUARD,S_CUTB(n)::QAB1(F),XP(l)
    • P(k);N_GUARD::R1(B)
  • Tries
    • Try
      • S(E);
      • Threat
        • QAR1(F)
      • Vars
        • S(i);N_GUARD,XS(E)::R(B)
        • B(g);N_GUARD::S(E),XP(k)
        • S(i);N_GUARD::R(B),XS(i)
        • S(i);N_GUARD,S_CUTR(a)::QAB(F)
        • S(i);N_GUARD::R(B)
      • Refutation
        • R(a);
    • Try
      • S(E);
      • Threat
        • QAR1(F)
      • Vars
        • R(a);N_GUARD::S(E),XR(a)
        • S(i);N_GUARD::QAB1(F),XP(l)
        • S(i);N_GUARD,S_CUTR(e)::R(B)
      • Refutation
        • B(g);
    • Try
      • R(B);CHECK
      • Refutation
        • S(i);XR(B)
  • Actual
    • S(E);
    • Threat
      • QAR1(F)
    • Vars
      • B(g);S_CUTR(e)::R1(C)
      • S(i);N_GUARD::QAB(F)
      • S(i);N_GUARD,S_CUTB(n)::QAB1(F),XP(l)
      • S(i);N_GUARD::QAB(F),XS(i)
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