MESON Chess Problem Database

Problem Display
PID: 249547 (8/8/2P5/2Q5/kn6/7B/3N4/1K6 w - - 0 1)

Maleika, Gerhard

Deutsche Schachzeitung, 1988

8/8/2P5/2Q5/kn6/7B/3N4/1K6

#2

5 + 2

5454 Near Snap 2021
6490 yacpdb 2021

SOLUTION

  • SOUND
  • Sets
    • 1...Ka3
      • 2.Qa5#
  • Tries
    • 1.Bg4?
      • 1...Ka3
        • 2.Qa5#
      • 1...Sxc6
        • 2.Bd1#
      • 1...Sa2
        • 2.Bd1#
      • 1...Sd3
        • 2.Bd1#
      • 1...Sd5
        • 2.Bd1#
      • 1...Sa6
        • 2.Bd1#
      • 1...Sc2!
    • 1.Bf5?
      • 1...Ka3
        • 2.Qa5#
      • 1...Sxc6
        • 2.Bc2#
      • 1...Sa2
        • 2.Bc2#
      • 1...Sc2
        • 2.Bxc2#
      • 1...Sd5
        • 2.Bc2#
      • 1...Sa6
        • 2.Bc2#
      • 1...Sd3!
    • 1.Be6?
      • 1...Ka3
        • 2.Qa5#
      • 1...Sxc6
        • 2.Bb3#
      • 1...Sa2
        • 2.Bb3#
      • 1...Sc2
        • 2.Bb3#
      • 1...Sd3
        • 2.Bb3#
      • 1...Sa6
        • 2.Bb3#
      • 1...Sd5!
    • 1.Qc4?
      • 1...Ka3
        • 2.Qb3#
      • 1...Ka5!
    • 1.Qb5+?
      • 1...Ka3
        • 2.Qa5#
      • 1...Kxb5!
    • 1.c7?
      • 1...Ka3
        • 2.Qa5#
      • 1...Sa2
        • 2.Bd7#
      • 1...Sc2
        • 2.Bd7#
      • 1...Sd3
        • 2.Bd7#
      • 1...Sd5
        • 2.Bd7#
      • 1...Sa6
        • 2.Bd7#
      • 1...Sc6!
  • Keys
    • 1.Bd7!
      • 1...Ka3
        • 2.Qa5#
      • 1...Sxc6
        • 2.Bxc6#
      • 1...Sa2
        • 2.c7#
      • 1...Sc2
        • 2.c7#
      • 1...Sd3
        • 2.c7#
      • 1...Sd5
        • 2.c7#
      • 1...Sa6
        • 2.c7#

Anticipated by 109451(1982)

This anticipates 7948(1994)

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 0
    • ADDED MATES = 6
    • REMOVED MATES = 0
  • Sets
    • K(a);P-FLIGHT,P_SPINS(b)::QAR2(D)
  • Tries
    • Try
      • B(C);
      • Vars
        • K(a);P-FLIGHT,P_SPINS(b)::QAR2(D)
        • S(b);N_GUARD,XP(E)::B(C)
        • S(b);N_GUARD::B(C)
      • Refutation
        • S(b);
    • Try
      • B(C);
      • Vars
        • K(a);P-FLIGHT,P_SPINS(b)::QAR2(D)
        • S(b);N_GUARD,XP(E)::B(C)
        • S(b);N_GUARD::B(C)
        • S(b);N_GUARD::B(C),XS(b)
      • Refutation
        • S(b);
    • Try
      • B(C);
      • Vars
        • K(a);P-FLIGHT,P_SPINS(b)::QAR2(D)
        • S(b);XP(E)::B(C)
        • S(b);::B(C)
      • Refutation
        • S(b);
    • Try
      • Q(D);P_PINS(b)
      • Vars
        • K(a);N_SPINS(b),P-FLIGHT::QAR1(D)
      • Refutation
        • K(a);N_SPINS(b),P-FLIGHT
    • Try
      • Q(D);CHECK
      • Vars
        • K(a);P-FLIGHT::QAR2(D)
      • Refutation
        • K(a);S_FLIGHT,XQ(D)
    • Try
      • P(E);
      • Vars
        • K(a);P-FLIGHT,P_SPINS(b)::QAR2(D)
        • S(b);N_GUARD::B(C)
      • Refutation
        • S(b);
  • Actual
    • B(C);
    • Vars
      • K(a);P-FLIGHT,P_SPINS(b)::QAR2(D)
      • S(b);OGATE,P_SPINS(b),XP(E)::B(C),XS(b)
      • S(b);N_GUARD::B(C)+P(E)
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