MESON Chess Problem Database

Problem Display
PID: 269496 (qb6/1pp1N3/r7/r5p1/p5Pk/7P/4BPP1/7K w - - 0 1)

Easter, Norris

British Chess Magazine, 1934

qb6/1pp1N3/r7/r5p1/p5Pk/7P/4BPP1/7K

#2

7 + 9

SOLUTION

  • SOUND
  • Sets
    • 1...Rf5
      • 2.Sxf5#
    • 1...Rg6
      • 2.Sxg6#
    • 1...Ra7
      • 2.Sg6#
    • 1...b5
      • 2.Sf5#
    • 1...b6
      • 2.Sg6#
    • 1...c5
      • 2.Sf5#
    • 1...c6
      • 2.Sg6#
  • Tries
    • 1.Bxa6?
      • threat
        • 2.Sg6#
      • 1...Rxa6
        • 2.Sf5#
      • 1...Qxa6!
  • Keys
    • 1.Bf1!
      • threat
        • 2.g3#
      • 1...b5
        • 2.Sf5#
      • 1...b6
        • 2.Sg6#
      • 1...c5
        • 2.Sf5#
      • 1...c6
        • 2.Sg6#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 0
    • REMOVED MATES = 3
  • Sets
    • R(c);N_GUARD::S(G),XR(c)
    • R(e);N_GUARD::S(G),XR(e)
    • R(e);N_GUARD::S(G)
    • P(f);P_PINP(D),S_CUTR(c)::S(G)
    • P(f);P_PINP(D),S_CUTR(e)::S(G)
    • P(g);S_CUTR(c)::S(G)
    • P(g);S_CUTR(e)::S(G)
  • Tries
    • Try
      • B(B);XR(e)
      • Threat
        • S(G)
      • Vars
        • R(c);N_GUARD,SBLOCK,XB(B)::S(G)
      • Refutation
        • Q(h);XB(B)
  • Actual
    • B(B);
    • Threat
      • P(D)
    • Vars
      • P(f);P_PINP(D),S_CUTR(c)::S(G)
      • P(f);P_PINP(D),S_CUTR(e)::S(G)
      • P(g);S_CUTR(c)::S(G)
      • P(g);S_CUTR(e)::S(G)
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