MESON Chess Problem Database

Problem Display
PID: 232410 (8/8/B2p4/2n2K2/kB3pQ1/3N4/2PN4/8 w - - 0 1)

Bottger, Horst

Freie Presse, 1992

8/8/B2p4/2n2K2/kB3pQ1/3N4/2PN4/8

#2

7 + 4

15148 Sadier Collection 2021
5454 Near Snap 2022

SOLUTION

  • SOUND
  • Sets
    • 1...Sb3
      • 2.cxb3#
    • 1...f3
      • 2.Sb2#
  • Tries
    • 1.Qg7?
      • threat
        • 2.Qa1#
      • 1...Sxa6
        • 2.Qd7#
      • 1...Sb3
        • 2.Qd7#
        • 2.cxb3#
      • 1...Sxd3!
    • 1.Qg8?
      • threat
        • 2.Qa2#
      • 1...Sxd3
        • 2.Qb3#
      • 1...Sxa6
        • 2.Qe8#
      • 1...Sb3
        • 2.Qxb3#
        • 2.Qe8#
        • 2.cxb3#
      • 1...Se6
        • 2.Qe8#
      • 1...d5!
    • 1.c3?
      • threat
        • 2.Sb2#
      • 1...Sxd3
        • 2.Qd1#
      • 1...Sxa6!
    • 1.c4?
      • threat
        • 2.Bb5#
      • 1...Sxa6
        • 2.Qd1#
      • 1...Sxd3!
  • Keys
    • 1.Qd1!
      • threat
        • 2.Qa1#
      • 1...Sxd3
        • 2.c3#
      • 1...Sxa6
        • 2.c4#
      • 1...Sb3
        • 2.cxb3#

This anticipates 84904(1993)

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 2
    • REMOVED MATES = 1
  • Sets
    • S(c);OGATE::P(A),XS(c)
    • P(b);::S(C)
  • Tries
    • Try
      • Q(E);
      • Threat
        • QAR(E)
      • Vars
        • S(c);N_GUARD,XB(G)::QAB(E)
      • Refutation
        • S(c);XS(C)
    • Try
      • Q(E);
      • Threat
        • QAR2(E)
      • Vars
        • S(c);N_GUARD,XS(C)::QAB1(E)
        • S(c);N_GUARD,XB(G)::QAB(E)
        • S(c);N_GUARD::QAB(E)
      • Refutation
        • P(d);
    • Try
      • P(A);
      • Threat
        • S(C)
      • Vars
        • S(c);N_GUARD,XS(C)::QAB(E)
      • Refutation
        • S(c);XB(G)
    • Try
      • P(A);
      • Threat
        • B(G)
      • Vars
        • S(c);N_GUARD,XB(G)::QAB(E)
      • Refutation
        • S(c);XS(C)
  • Actual
    • Q(E);
    • Threat
      • QAR(E)
    • Vars
      • S(c);N_GUARD,XS(C)::QAB(E)+P(A)
      • S(c);N_GUARD,XB(G)::QAB(E)+P(A)
      • S(c);OGATE::P(A),XS(c)
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