MESON Chess Problem Database

Problem Display
PID: 146833 (3R4/1pBb2NQ/4p3/1Rpk2p1/K3N1r1/4PB1n/1P4r1/8 w - - 0 1)

Easter, Norris

Grantham Journal, 1926

(First published on Sat Jun 12 1926)

3R4/1pBb2NQ/4p3/1Rpk2p1/K3N1r1/4PB1n/1P4r1/8

#2

10 + 9

5454 Near Snap 2013
14868 Pirnie Collection 2013

SOLUTION

  • SOUND
  • Sets
    • 1...Kc4
      • 2.Sd6#
    • 1...Kc6
      • 2.Rxc5#
    • 1...Rxe4+
      • 2.Qxe4#
    • 1...Sf4
      • 2.Sd2#
  • Tries
    • 1.Kb3?
      • threat
        • 2.Sc3#
        • 2.Sf6#
        • 2.Rxc5#
      • 1...Kc6
        • 2.Rxc5#
      • 1...Rxe4
        • 2.Bxe4#
        • 2.Qxe4#
      • 1...Rc2
        • 2.Sc3#
        • 2.Sf6#
      • 1...b6
        • 2.Sc3#
        • 2.Sf6#
      • 1...Rxb2+!
    • 1.Rxd7+?
      • 1...Kc4
        • 2.Sd6#
        • 2.Rxc5#
        • 2.b3#
      • 1...Kc6!
    • 1.Qf5+?
      • 1...Kc4
        • 2.Sd6#
      • 1...Kc6
        • 2.Rxc5#
        • 2.Qxc5#
      • 1...e5
        • 2.Qe6#
      • 1...exf5!
  • Keys
    • 1.Qg6!
      • threat
        • 2.Qxe6#
      • 1...Rxe4+
        • 2.Qxe4#
      • 1...Kc4
        • 2.Sd6#
      • 1...Kc6
        • 2.Rxc5#
      • 1...Sf4
        • 2.Sd2#
      • 1...e5
        • 2.Qe6#

This anticipates 146834(1933)

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 1
    • REMOVED MATES = 0
  • Sets
    • K(e);N_PINS(E),N_SPINB(i),N_SPINP(d),S_FLIGHT::S(E)
    • K(e);N_PINR(F),N_SPINB(i),N_SPINP(d),S_FLIGHT::R1(F),XP(d)
    • R(c);CHECK,OGATE,P_SPINR(c),XS(E)::QAB1(I),XR(c)
    • S(b);N_PINS(E)::B(C)+S(E)
  • Tries
    • Try
      • K(D);N_SPINR(F),N_SPINS(E),S_FLIGHT
      • Threat
        • DUALS(3)
      • Vars
        • K(e);N_SPINB(i),N_SPINP(d),S_FLIGHT::R1(F),XP(d)
      • Refutation
        • R(a);CHECK,XP(A)
    • Try
      • R(J);CHECK,N_SPINR(F),XB(i)
      • Refutation
        • K(e);N_SPINP(d),S_FLIGHT
    • Try
      • Q(I);CHECK
      • Vars
        • K(e);N_PINS(E),N_SPINB(i),N_SPINP(d),S_FLIGHT::S(E)
        • P(g);::QAB1(I)
      • Refutation
        • P(g);XQ(I)
  • Actual
    • Q(I);
    • Threat
      • QAB1(I),XP(g)
    • Vars
      • R(c);CHECK,OGATE,P_SPINR(c),XS(E)::QAB1(I),XR(c)
      • K(e);N_PINS(E),N_SPINB(i),N_SPINP(d),S_FLIGHT::S(E)
      • K(e);N_PINR(F),N_SPINB(i),N_SPINP(d),P_SPINP(g),S_FLIGHT::R1(F),XP(d)
      • S(b);N_PINS(E)::B(C)+S(E)
      • P(g);::QAB1(I)
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