MESON Chess Problem Database

Problem Display
PID: 6479 (8/qR6/RrNPQ3/rk1K4/3pp3/p2N4/8/5B2 w - - 0 1)

Schiffmann, Israel Abraham

1st HM., Tijdschrift vd KNSB, 1929

8/qR6/RrNPQ3/rk1K4/3pp3/p2N4/8/5B2

#2

8 + 7

1397 Faszinierendes Schachproblem 1963

SOLUTION

  • SOUND
  • Sets
    • 1...Ka4+
      • 2.Sc5#
    • 1...Kxa6+
      • 2.Sc5#
    • 1...Qb8
      • 2.Rxa5#
    • 1...Qxb7
      • 2.Rxa5#
  • Tries
    • 1.Sxd4+?
      • 1...Kxa6+
        • 2.Sc5#
      • 1...Ka4+!
    • 1.Sxa7+?
      • 1...Kxa6+
        • 2.Sc5#
      • 1...Ka4+!
    • 1.Rbxb6+?
      • 1...Ka4+
        • 2.Sc5#
      • 1...Qxb6!
  • Keys
    • 1.Kxd4!
      • threat
        • 2.Qc4#
      • 1...Ra4+
        • 2.Sdb4#
      • 1...Rxb7+
        • 2.Sc5#
      • 1...Ka4
        • 2.Sc5#
      • 1...Kxa6
        • 2.Sc5#
      • 1...Kxc6
        • 2.Qd7#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 2
  • Sets
    • K(e);CHECK,N_SPINR(f),P_SPINR(d),S_FLIGHT::S(B)
    • K(e);CHECK,N_SPINR(f),S_FLIGHT,XR(D)::B(A)+S(B),DCHECK
    • Q(g);N_GUARD::R1(D),XR(d)
    • Q(g);N_GUARD,N_SPINR(f),P_PINS(E),XR(H)::R1(D),XR(d)
  • Tries
    • Try
      • S(E);CHECK,XP(b)
      • Vars
        • K(e);CHECK,N_SPINR(f),S_FLIGHT,XR(D)::B(A)+S(B),DCHECK
      • Refutation
        • K(e);CHECK,N_SPINR(f),P_SPINR(d),S_FLIGHT
    • Try
      • S(E);CHECK,XQ(g)
      • Vars
        • K(e);CHECK,N_SPINR(f),S_FLIGHT,XR(D)::B(A)+S(B),DCHECK
      • Refutation
        • K(e);CHECK,N_SPINR(f),P_SPINR(d),S_FLIGHT
    • Try
      • R(H);CHECK,XR(f)
      • Vars
        • K(e);CHECK,P_SPINR(d),S_FLIGHT::S(B)
      • Refutation
        • Q(g);XR(H)
  • Actual
    • K(C);P-FLIGHT,XP(b)
    • Threat
      • QAB1(G)
    • Vars
      • R(d);CHECK::B(A)+S(B)
      • R(f);CHECK,N_SPINR(f),XR(H)::B(A)+S(B)
      • K(e);N_SPINR(f),P_SPINR(d),S_FLIGHT::S(B)
      • K(e);N_SPINR(f),S_FLIGHT,XR(D)::B(A)+S(B),DCHECK
      • K(e);OGATEB,S_FLIGHT,XS(E)::QAB1(G)
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