MESON Chess Problem Database

Problem Display
PID: 164254 (4k2r/7p/1p2K3/4N1N1/6Q1/8/8/4R3 w k - 0 1)

Barnes, Barry Peter

Die Schwalbe, 1970

4k2r/7p/1p2K3/4N1N1/6Q1/8/8/4R3

#2

5 + 4

5454 Near Snap 2017

SOLUTION

  • SOUND
  • Sets
    • 1...0-0
      • 2.Sgf7#
  • Tries
    • 1.Kd6?
      • threat
        • 2.Qc8#
      • 1...Kd8
        • 2.Sc6#
        • 2.Sef7#
        • 2.Qd7#
      • 1...0-0
        • 2.Sgf7#
      • 1...Kf8!
    • 1.Qh5+?
      • 1...Kf8
        • 2.Qf7#
      • 1...Kd8!
    • 1.Qa4+?
      • 1...Kd8
        • 2.Qd7#
      • 1...b5
        • 2.Qa8#
      • 1...Kf8!
  • Keys
    • 1.Kf6!
      • threat
        • 2.Qc8#
      • 1...Rf8+
        • 2.Sef7#
      • 1...0-0+
        • 2.Sgf7#
      • 1...Kd8
        • 2.Qd7#
      • 1...Kf8
        • 2.Qc8#

Anticipated by 21372(1918)

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 0
  • Sets
    • K(c);0-0::QAR(B)+S(D)
  • Tries
    • Try
      • K(E);P-FLIGHT
      • Threat
        • QAR2(B)
      • Vars
        • K(c);0-0::QAR(B)+S(D)
      • Refutation
        • K(c);P-FLIGHT
    • Try
      • Q(B);CHECK
      • Vars
        • K(c);P-FLIGHT::QAR1(B)
      • Refutation
        • K(c);P-FLIGHT
    • Try
      • Q(B);CHECK
      • Vars
        • K(c);P-FLIGHT::QAR1(B)
        • P(a);P_SPINP(a)::QAR(B)
      • Refutation
        • K(c);P-FLIGHT
  • Actual
    • K(E);P-FLIGHT
    • Threat
      • QAR2(B)
    • Vars
      • R(d);CHECK,SBLOCK::R(A)+S(C)
      • K(c);0-0,CHECK::QAR(B)+S(D)
      • K(c);P-FLIGHT::QAR1(B)
      • K(c);P-FLIGHT::QAR(B)
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