MESON Chess Problem Database

Problem Display
PID: 227955 (N7/5p2/p1K2P1Q/1Rp5/n1kB4/2Pp4/8/8 w - - 0 1)

Keller, Michael

Schweizerische Schachzeitung, 1985

N7/5p2/p1K2P1Q/1Rp5/n1kB4/2Pp4/8/8

#2

7 + 6

SOLUTION

  • SOUND
  • Sets
    • 1...Sb2
      • 2.Sb6#
    • 1...Sb6
      • 2.Sxb6#
  • Tries
    • 1.Qf4?
      • threat
        • 2.Be5#
      • 1...Sxc3
        • 2.Sb6#
      • 1...cxd4
        • 2.Qxd4#
      • 1...d2
        • 2.Qf1#
      • 1...axb5!
    • 1.Qf8?
      • threat
        • 2.Qxf7#
      • 1...Sxc3
        • 2.Qxc5#
      • 1...cxd4
        • 2.Qb4#
      • 1...Sb6
        • 2.Sxb6#
        • 2.Qxc5#
      • 1...d2!
    • 1.Qh5?
      • threat
        • 2.Qxf7#
        • 2.Qd5#
      • 1...Sxc3
        • 2.Qxc5#
      • 1...d2
        • 2.Qe2#
      • 1...Sb6
        • 2.Sxb6#
        • 2.Qxc5#
      • 1...cxd4!
  • Keys
    • 1.Qd2!
      • threat
        • 2.Qa2#
      • 1...Sxc3
        • 2.Qxc3#
      • 1...cxd4
        • 2.Rb4#
      • 1...Sb2
        • 2.Sb6#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 2
    • REMOVED MATES = 1
  • Sets
    • S(b);N_GUARD::S(G)
    • S(b);N_GUARD::S(G),XS(b)
  • Tries
    • Try
      • Q(F);
      • Threat
        • QAR(F)+B(B)
      • Vars
        • S(b);N_GUARD,XP(A)::S(G)
        • P(d);OGATE,P_SPINP(d),XB(B)::QAR1(F),XP(d)
        • P(a);OGATEB::QAB(F)
      • Refutation
        • P(e);XR(C)
    • Try
      • Q(F);
      • Threat
        • QAB(F),XP(f)
      • Vars
        • S(b);N_GUARD,XP(A)::QAR1(F),XP(d)
        • P(d);OGATE,XB(B)::QAR1(F)
      • Refutation
        • P(a);
    • Try
      • Q(F);
      • Threat
        • DUALS(2)
      • Vars
        • S(b);N_GUARD,XP(A)::QAR1(F),XP(d)
        • P(a);OGATEB::QAB(F)
      • Refutation
        • P(d);XB(B)
  • Actual
    • Q(F);
    • Threat
      • QAB(F)
    • Vars
      • S(b);OGATE,XP(A)::QAR1(F),XS(b)
      • P(d);N_GUARD,XB(B)::R1(C)
      • S(b);N_GUARD::S(G)
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