MESON Chess Problem Database

Problem Display
PID: 80767 (3N2Bb/2pp4/2pk4/n3p1B1/8/2KNRr2/7Q/3R1r2 w - - 0 1)

Shahaf, Eliahu (formerly Feigin, Eliahu)

The Field, 1949

(First published on Sat Jan 1 1949)

3N2Bb/2pp4/2pk4/n3p1B1/8/2KNRr2/7Q/3R1r2

#2

8 + 9

SOLUTION

  • SOUND
  • Sets
    • 1...Rf6
      • 2.Qxe5#
    • 1...Sb3
      • 2.Sb7#
    • 1...Sc4
      • 2.Sb7#
    • 1...Sb7
      • 2.Sxb7#
    • 1...c5
      • 2.Se1#
  • Tries
    • 1.Sf2+?
      • 1...Rxd1
        • 2.Se4#
      • 1...Kc5!
    • 1.Sc5+?
      • 1...Rxd1
        • 2.Se4#
      • 1...Kxc5!
  • Keys
    • 1.Rxe5!
      • threat
        • 2.Be7#
      • 1...Rxd3+
        • 2.Rxd3#
      • 1...Bxe5+
        • 2.Qxe5#
      • 1...Rf6
        • 2.Se1#
      • 1...Rf7
        • 2.Se1#
      • 1...Bf6
        • 2.Sf7#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 1
    • ADDED MATES = 4
    • REMOVED MATES = 4
  • Sets
    • R(b);S_CUTB(i)::QAB1(B),XP(d)
    • S(c);N_GUARD::S(G)
    • S(c);N_GUARD::S(G),XS(c)
    • P(e);SBLOCK::R(A)+S(D)
  • Tries
    • Try
      • S(D);CHECK,P_SPINR(E)
      • Vars
        • R(a);XR(A)::S(D)
      • Refutation
        • K(f);N_SPINP(d),S_FLIGHT
    • Try
      • S(D);CHECK,P_SPINR(E)
      • Vars
        • R(a);XR(A)::S(D)
      • Refutation
        • K(f);N_SPINP(d),S_FLIGHT,XS(D)
  • Actual
    • R(E);P_SPINR(E),P_SPINS(D),XP(d)
    • Threat
      • B(F)
    • Vars
      • R(b);CHECK,OGATE,P_SPINR(b),XS(D)::R(A),XR(b)
      • B(i);CHECK,OGATE,P_SPINB(i),XR(E)::QAB1(B),XB(i)
      • R(b);N_PINR(E),N_PINS(D)::R(A)+S(D)
      • R(b);N_PINS(D)::R(A)+S(D)
      • B(i);S_CUTR(b)::S(G)
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