MESON Chess Problem Database

Problem Display
PID: 176209 (b1n1r3/5R2/6pq/2Q1p3/2B1k3/1N6/K2p3n/B7 w - - 0 1)

Keller, Michael

Schach-Echo, 1972

b1n1r3/5R2/6pq/2Q1p3/2B1k3/1N6/K2p3n/B7

#2

6 + 9

6490 yacpdb 2018

SOLUTION

  • SOUND
  • Sets
    • 1...Qg7
      • 2.Sxd2#
    • 1...Qf8
      • 2.Sxd2#
    • 1...Qh3
      • 2.Sxd2#
    • 1...Qh4
      • 2.Sxd2#
    • 1...Qh5
      • 2.Sxd2#
    • 1...Qh7
      • 2.Sxd2#
    • 1...Qh8
      • 2.Sxd2#
    • 1...Rd8
      • 2.Qxe5#
    • 1...Rf8
      • 2.Qxe5#
    • 1...Rg8
      • 2.Qxe5#
    • 1...Rh8
      • 2.Qxe5#
    • 1...Se7
      • 2.Qxe5#
    • 1...g5
      • 2.Sxd2#
  • Tries
    • 1.Qg1?
      • threat
        • 2.Sc5#
      • 1...Qe3
        • 2.Qxg6#
      • 1...Qf8
        • 2.Sxd2#
      • 1...Qf4!
    • 1.Qf2?
      • threat
        • 2.Sc5#
      • 1...Qf8
        • 2.Sxd2#
        • 2.Qe2#
      • 1...Qe3!
    • 1.Qd5+?
      • 1...Ke3
        • 2.Qd3#
      • 1...Bxd5!
  • Keys
    • 1.Qa3!
      • threat
        • 2.Sc5#
      • 1...Ke3
        • 2.Sc5#
      • 1...Qe3
        • 2.Qxa8#
      • 1...Qf8
        • 2.Sxd2#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 2
    • REMOVED MATES = 12
  • Sets
    • Q(f);N_GUARD::S(C),XP(a)
    • R(i);N_GUARD::QAR1(E),XP(d)
    • S(h);S_CUTR(i)::QAR1(E),XP(d)
    • P(e);S_CUTQ(f)::S(C),XP(a)
  • Tries
    • Try
      • Q(E);
      • Threat
        • S(C)
      • Vars
        • Q(f);N_GUARD,SBLOCK::QAB(E),XP(e)
        • Q(f);N_GUARD::S(C),XP(a)
      • Refutation
        • Q(f);
    • Try
      • Q(E);
      • Threat
        • S(C)
      • Refutation
        • Q(f);
    • Try
      • Q(E);CHECK
      • Vars
        • K(c);P-FLIGHT::QAR1(E)
      • Refutation
        • B(g);XQ(E)
  • Actual
    • Q(E);
    • Threat
      • S(C)
    • Vars
      • K(c);P-FLIGHT::QAR(E)+S(C)
      • Q(f);SBLOCK::QAB(E),XB(g)
      • Q(f);N_GUARD::S(C),XP(a)
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