MESON Chess Problem Database

Problem Display
PID: 11490 (B3n3/Q1p2p2/1r5B/5PKP/6pr/1NP1kp1b/2R2b2/2N5 w - - 0 1)

Easter, Norris

Chess, 1939

B3n3/Q1p2p2/1r5B/5PKP/6pr/1NP1kp1b/2R2b2/2N5

#2

10 + 10

1101 BCSC Final 2001-2002
56 The Problemist 2002

SOLUTION

  • SOUND
  • Sets
    • 1...Rxh5+
      • 2.Kxh5#
    • 1...Bg1
      • 2.Kxh4#
    • 1...Sd6
      • 2.Kf6#
    • 1...g3
      • 2.Kxh4#
    • 1...c6
      • 2.Qe7#
    • 1...f6+
      • 2.Kg6#
  • Tries
    • 1.Sa5?
      • threat
        • 2.Sc4#
      • 1...Rxh5+
        • 2.Kxh5#
      • 1...f6+
        • 2.Kg6#
      • 1...c6
        • 2.Qe7#
      • 1...Sd6
        • 2.Kf6#
      • 1...g3
        • 2.Kxh4#
      • 1...Bf1!
    • 1.Qxb6+?
      • 1...c5
        • 2.Qxc5#
      • 1...cxb6!
  • Keys
    • 1.Sd2!
      • threat
        • 2.Sc4#
      • 1...Rxh5+
        • 2.Kxh5#
      • 1...f6+
        • 2.Kg6#
      • 1...Bf1
        • 2.Sxf1#
      • 1...Sd6
        • 2.Kf6#
      • 1...g3
        • 2.Kxh4#
      • 1...c6
        • 2.Qe7#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 1
    • REMOVED MATES = 1
  • Sets
    • R(f);CHECK,XP(G)::B(H)+K(F),XR(f)
    • B(a);::B(H)+K(F),XR(f)
    • S(j);::B(H)+K(F)
    • P(e);::B(H)+K(F),XR(f)
    • P(h);OGATE::QAR(I)
    • P(i);CHECK::B(H)+K(F)
  • Tries
    • Try
      • S(C);
      • Threat
        • S(C)
      • Vars
        • R(f);CHECK,XP(G)::B(H)+K(F),XR(f)
        • P(i);CHECK::B(H)+K(F)
        • P(h);OGATE::QAR(I)
        • S(j);::B(H)+K(F)
        • P(e);::B(H)+K(F),XR(f)
      • Refutation
        • B(d);
    • Try
      • Q(I);CHECK,XR(g)
      • Vars
        • P(h);P_SPINP(h)::QAB(I),XP(h)
      • Refutation
        • P(h);XQ(I)
  • Actual
    • S(C);
    • Threat
      • S(C)
    • Vars
      • R(f);CHECK,XP(G)::B(H)+K(F),XR(f)
      • P(i);CHECK::B(H)+K(F)
      • B(d);N_GUARD::S(C),XB(d)
      • S(j);::B(H)+K(F)
      • P(e);::B(H)+K(F),XR(f)
      • P(h);OGATE::QAR(I)
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Developed and maintained by Brian Stephenson.
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