MESON Chess Problem Database

Problem Display
PID: 226351 (2R4B/1p3K2/8/3kpN1Q/6P1/4p1p1/b2NP3/3Rq1b1 w - - 0 1)

Easter, Norris

British Chess Magazine, 1931

2R4B/1p3K2/8/3kpN1Q/6P1/4p1p1/b2NP3/3Rq1b1

#2

9 + 8

SOLUTION

  • SOUND
  • Tries
    • 1.Sb1+?
      • 1...Qd2
        • 2.Sc3#
      • 1...Qxd1
        • 2.Sc3#
      • 1...Ke4+!
    • 1.Se4+?
      • 1...Qd2
        • 2.Sc3#
        • 2.Sf6#
      • 1...Qxd1
        • 2.Sc3#
        • 2.Sf6#
      • 1...Kxe4+!
    • 1.Sxe3+?
      • 1...Kd6+
        • 2.Sdc4#
      • 1...Bxe3
        • 2.Qxe5#
      • 1...Kd4+!
    • 1.Sxg3?
      • threat
        • 2.Qxe5#
      • 1...Kd4+
        • 2.Sb3#
      • 1...Kd6+
        • 2.Sc4#
      • 1...Qf2+
        • 2.Sf3#
      • 1...Qf1+
        • 2.Sdxf1#
      • 1...Qxg3!
    • 1.Se7+?
      • 1...Kd6+
        • 2.Sc4#
      • 1...Kd4+!
    • 1.Qh1+?
      • 1...e4
        • 2.Qxe4#
      • 1...g2!
  • Keys
    • 1.Sd6!
      • threat
        • 2.Qxe5#
      • 1...Kd4+
        • 2.Sb3#
      • 1...Kxd6+
        • 2.Sc4#
      • 1...Qf2+
        • 2.Sf3#
      • 1...Qf1+
        • 2.Sxf1#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 4
    • REMOVED MATES = 0
  • Sets
  • Tries
    • Try
      • S(B);CHECK
      • Vars
        • Q(a);P_SPINQ(a)::S(B)
        • Q(a);XR(A)::S(B)
      • Refutation
        • K(f);CHECK,S_FLIGHT
    • Try
      • S(B);CHECK
      • Refutation
        • K(f);CHECK,S_FLIGHT,XS(B)
    • Try
      • S(E);CHECK,P_PINP(g),XP(d)
      • Vars
        • K(f);CHECK,N_SPINP(g),P-FLIGHT::R(A)+S(B),DCHECK
        • B(b);XS(E)::QAR1(F),XP(g)
      • Refutation
        • K(f);CHECK,P-FLIGHT
    • Try
      • S(E);P_PINP(g),XP(e)
      • Threat
        • QAR1(F),XP(g)
      • Vars
        • K(f);CHECK,P-FLIGHT::R(A)+S(B),DCHECK
        • K(f);CHECK,N_SPINP(g),P-FLIGHT::R(A)+S(B),DCHECK
        • Q(a);CHECK,N_GUARD::R(A)+S(B)
        • Q(a);CHECK,N_GUARD::R(A)+S(B),XQ(a)
      • Refutation
        • Q(a);XS(E)
    • Try
      • S(E);CHECK,P_PINP(g)
      • Vars
        • K(f);CHECK,N_SPINP(g),P-FLIGHT::R(A)+S(B),DCHECK
      • Refutation
        • K(f);CHECK,P-FLIGHT
    • Try
      • Q(F);CHECK
      • Vars
        • P(g);P_SPINP(g)::QAB1(F),XP(g)
      • Refutation
        • P(e);P_SPINP(e)
  • Actual
    • S(E);P_PINP(g)
    • Threat
      • QAR1(F),XP(g)
    • Vars
      • K(f);CHECK,P-FLIGHT::R(A)+S(B),DCHECK
      • K(f);CHECK,N_SPINP(g),P-FLIGHT,XS(E)::R(A)+S(B),DCHECK
      • Q(a);CHECK,N_GUARD::R(A)+S(B)
      • Q(a);CHECK,N_GUARD::R(A)+S(B),XQ(a)
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