MESON Chess Problem Database

Problem Display
PID: 23549 (k5q1/2Q5/p7/3N4/2K1B3/8/8/8 w - - 0 1)

Piatesi, Antonio

L'Italia Scacchistica, 1971

k5q1/2Q5/p7/3N4/2K1B3/8/8/8

#2

4 + 3

2786 More Fun with Chess Miniatures 2000
5454 Near Snap 2009
3713 Snap 2022

SOLUTION

  • SOUND
  • Sets
    • 1...Qxd5+
      • 2.Bxd5#
    • 1...Qh7
      • 2.Sb6#
    • 1...Qg1
      • 2.Sc3#
      • 2.Se3#
      • 2.Sb4#
      • 2.Sf4#
      • 2.Sb6#
      • 2.Sf6#
      • 2.Se7#
    • 1...Qg2
      • 2.Sb6#
    • 1...Qg3
      • 2.Sc3#
      • 2.Se3#
      • 2.Sb4#
      • 2.Sf4#
      • 2.Sb6#
      • 2.Sf6#
      • 2.Se7#
    • 1...Qg4
      • 2.Sf4#
      • 2.Sb6#
    • 1...Qg5
      • 2.Sb6#
    • 1...Qg6
      • 2.Sb6#
    • 1...Qg7
      • 2.Sc3#
      • 2.Se3#
      • 2.Sb4#
      • 2.Sf4#
      • 2.Sb6#
      • 2.Sf6#
      • 2.Se7#
    • 1...Qb8
      • 2.Sb6#
    • 1...Qc8
      • 2.Sb6#
    • 1...Qd8
      • 2.Sb6#
    • 1...Qe8
      • 2.Sb6#
    • 1...Qf8
      • 2.Sc3#
      • 2.Se3#
      • 2.Sb4#
      • 2.Sf4#
      • 2.Sb6#
      • 2.Sf6#
      • 2.Se7#
    • 1...Qh8
      • 2.Sc3#
      • 2.Se3#
      • 2.Sb4#
      • 2.Sf4#
      • 2.Sb6#
      • 2.Sf6#
      • 2.Se7#
  • Tries
    • 1.Kd3?
      • threat
        • 2.Sb6#
      • 1...Qxd5+
        • 2.Bxd5#
      • 1...Qg3+
        • 2.Se3#
      • 1...Qd8!
    • 1.Kb4?
      • threat
        • 2.Sb6#
      • 1...Qf8+
        • 2.Se7#
      • 1...Qxd5
        • 2.Bxd5#
      • 1...a5+!
    • 1.Kd4?
      • threat
        • 2.Sb6#
      • 1...Qxd5+
        • 2.Bxd5#
      • 1...Qg1+
        • 2.Se3#
      • 1...Qg7+
        • 2.Sf6#
      • 1...Qh8+
        • 2.Sf6#
      • 1...Qd8!
    • 1.Kc5?
      • threat
        • 2.Sb6#
      • 1...Qxd5+
        • 2.Bxd5#
      • 1...Qg1+
        • 2.Se3#
      • 1...Qf8+
        • 2.Se7#
      • 1...Qg5!
  • Keys
    • 1.Kc3!
      • threat
        • 2.Sb6#
      • 1...Qg3+
        • 2.Se3#
      • 1...Qg7+
        • 2.Sf6#
      • 1...Qh8+
        • 2.Sf6#
      • 1...Qxd5
        • 2.Bxd5#

Anticipated by 79250(1962), 107156(1967)

This anticipates 262360(1985)

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 8
  • Sets
    • Q(c);CHECK,OGATE,P_SPINQ(c),XS(C)::B(B),XQ(c)
    • Q(c);N_PINS(C)::B(B)+S(C),DCHECK
    • Q(c);N_PINS(C),P_PINQ(D)::B(B)+S(C),DCHECK
  • Tries
    • Try
      • K(A);N_SPINS(C),S_FLIGHT
      • Threat
        • B(B)+S(C),DCHECK
      • Vars
        • Q(c);CHECK,OGATE,P_SPINQ(c),XS(C)::B(B),XQ(c)
        • Q(c);CHECK,N_GUARD::B(B)+S(C)
      • Refutation
        • Q(c);P_PINS(C)
    • Try
      • K(A);N_SPINS(C),P-FLIGHT
      • Threat
        • B(B)+S(C),DCHECK
      • Vars
        • Q(c);CHECK,N_GUARD::B(B)+S(C)
        • Q(c);OGATE,P_SPINQ(c),XS(C)::B(B),XQ(c)
      • Refutation
        • P(a);CHECK
    • Try
      • K(A);N_SPINS(C),P-FLIGHT
      • Threat
        • B(B)+S(C),DCHECK
      • Vars
        • Q(c);CHECK,OGATE,P_SPINQ(c),XS(C)::B(B),XQ(c)
        • Q(c);CHECK,N_GUARD::B(B)+S(C)
        • Q(c);CHECK,N_GUARD,SBLOCK::B(B)+S(C)
      • Refutation
        • Q(c);P_PINS(C)
    • Try
      • K(A);N_SPINS(C),P-FLIGHT
      • Threat
        • B(B)+S(C),DCHECK
      • Vars
        • Q(c);CHECK,OGATE,P_SPINQ(c),XS(C)::B(B),XQ(c)
        • Q(c);CHECK,N_GUARD::B(B)+S(C)
      • Refutation
        • Q(c);P_PINS(C)
  • Actual
    • K(A);N_SPINS(C),P-FLIGHT
    • Threat
      • B(B)+S(C),DCHECK
    • Vars
      • Q(c);CHECK,N_GUARD::B(B)+S(C)
      • Q(c);CHECK,N_GUARD,SBLOCK::B(B)+S(C)
      • Q(c);OGATE,P_SPINQ(c),XS(C)::B(B),XQ(c)
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