MESON Chess Problem Database

Problem Display
PID: 204611 (7K/8/Q3B3/6k1/5N2/8/5P2/8 w - - 0 1)

Aschemann, Ralf

Deutsche Schachzeitung, 1977

7K/8/Q3B3/6k1/5N2/8/5P2/8

#2

5 + 1

5454 Near Snap 2020
15148 Sadier Collection 2020

SOLUTION

  • SOUND
  • Tries
    • 1.Bh3?
      • 1...Kh4
        • 2.Qf6#
        • 2.Qh6#
      • 1...Kxf4!
    • 1.Bd7?
      • 1...Kh4
        • 2.Qf6#
        • 2.Qh6#
      • 1...Kxf4!
    • 1.Bc8?
      • 1...Kh4
        • 2.Qf6#
        • 2.Qh6#
      • 1...Kxf4!
    • 1.Qe2?
      • 1...Kxf4
        • 2.Qe3#
      • 1...Kh4
        • 2.Qg4#
        • 2.Qh5#
      • 1...Kh6
        • 2.Qh5#
      • 1...Kf6!
    • 1.Qd3?
      • 1...Kxf4
        • 2.Qf5#
        • 2.Qe3#
      • 1...Kh4
        • 2.Qg3#
        • 2.Qd8#
      • 1...Kh6
        • 2.Qg6#
      • 1...Kf6!
    • 1.Qb5+?
      • 1...Kxf4
        • 2.Qf5#
      • 1...Kh4
        • 2.Sg2#
        • 2.Sg6#
        • 2.Qh5#
      • 1...Kh6
        • 2.Qh5#
      • 1...Kf6!
    • 1.Qb7?
      • 1...Kh4
        • 2.Qe7#
      • 1...Kf6
        • 2.Qg7#
      • 1...Kh6
        • 2.Qg7#
      • 1...Kxf4!
    • 1.Qa1?
      • 1...Kh4
        • 2.Qf6#
      • 1...Kh6
        • 2.Qf6#
        • 2.Qg7#
      • 1...Kxf4!
    • 1.Qa5+?
      • 1...Kxf4
        • 2.Qf5#
      • 1...Kh4
        • 2.Sg2#
        • 2.Sg6#
        • 2.Qd8#
        • 2.Qh5#
      • 1...Kh6
        • 2.Qh5#
      • 1...Kf6!
  • Keys
    • 1.Qa7!
      • 1...Kxf4
        • 2.Qe3#
      • 1...Kh4
        • 2.Qe7#
      • 1...Kf6
        • 2.Qg7#
      • 1...Kh6
        • 2.Qg7#

Anticipated by 10280(1963)

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 0
    • ADDED MATES = 4
    • REMOVED MATES = 0
  • Sets
  • Tries
    • Try
      • B(D);
      • Refutation
        • K(a);S_FLIGHT,XS(B)
    • Try
      • B(D);
      • Refutation
        • K(a);S_FLIGHT,XS(B)
    • Try
      • B(D);
      • Refutation
        • K(a);S_FLIGHT,XS(B)
    • Try
      • Q(C);
      • Vars
        • K(a);OGATEB,S_FLIGHT,XS(B)::QAB1(C)
        • K(a);S_FLIGHT::QAR1(C)
      • Refutation
        • K(a);S_FLIGHT
    • Try
      • Q(C);
      • Vars
        • K(a);S_FLIGHT::QAR1(C)
      • Refutation
        • K(a);S_FLIGHT
    • Try
      • Q(C);CHECK
      • Vars
        • K(a);S_FLIGHT,XS(B)::QAR1(C)
        • K(a);OGATE,S_FLIGHT::QAR1(C)
      • Refutation
        • K(a);S_FLIGHT
    • Try
      • Q(C);
      • Vars
        • K(a);S_FLIGHT::QAB(C)
        • K(a);S_FLIGHT::QAB1(C)
      • Refutation
        • K(a);S_FLIGHT,XS(B)
    • Try
      • Q(C);
      • Vars
        • K(a);S_FLIGHT::QAB(C)
      • Refutation
        • K(a);S_FLIGHT,XS(B)
    • Try
      • Q(C);CHECK
      • Vars
        • K(a);S_FLIGHT,XS(B)::QAR1(C)
        • K(a);OGATE,S_FLIGHT::QAR1(C)
      • Refutation
        • K(a);S_FLIGHT
  • Actual
    • Q(C);
    • Vars
      • K(a);OGATEB,S_FLIGHT,XS(B)::QAB1(C)
      • K(a);S_FLIGHT::QAB(C)
      • K(a);S_FLIGHT::QAB1(C)
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