MESON Chess Problem Database

Problem Display
PID: 247462 (1bb1RQ2/8/7B/2ppr1N1/1P6/3PkNrR/5p1q/3K1B2 w - - 0 1)

Easter, Norris

British Chess Magazine, 1931

1bb1RQ2/8/7B/2ppr1N1/1P6/3PkNrR/5p1q/3K1B2

#2

10 + 9

SOLUTION

  • SOUND
  • Sets
    • 1...Ba7
      • 2.Rxe5#
    • 1...Bg4
      • 2.Sh7#
  • Tries
    • 1.Se6+?
      • 1...Rgg5
        • 2.Sxh2#
      • 1...Reg5!
    • 1.Sf7+?
      • 1...Kxf3
        • 2.Sxe5#
      • 1...Rg5!
    • 1.Qxc5+?
      • 1...d4
        • 2.Qxd4#
        • 2.Qc1#
      • 1...Kf4!
  • Keys
    • 1.Sd4!
      • threat
        • 2.Sc2#
      • 1...Bg4+
        • 2.Sgf3#
      • 1...Kxd4
        • 2.Qxc5#
      • 1...cxd4
        • 2.Sh7#
      • 1...Bf5
        • 2.Sge6#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 1
    • ADDED MATES = 3
    • REMOVED MATES = 1
  • Sets
    • B(h);N_GUARD::R(I),XR(g)
    • B(i);P_PINS(D),S_CUTR(d)::B(H)+S(G)
  • Tries
    • Try
      • S(G);CHECK,N_PINR(g)
      • Vars
        • R(d);P_SPINR(d),S_CUTR(g)::R(E)+S(D),XQ(b)
      • Refutation
        • R(g);P_SPINR(g)
    • Try
      • S(G);CHECK
      • Vars
        • K(c);N_SPINR(g),P-FLIGHT,P_SPINR(d),XS(D)::QAR(J)+S(G),DCHECK,XR(g)
      • Refutation
        • R(d);
    • Try
      • Q(J);CHECK,XP(e)
      • Refutation
        • K(c);N_SPINR(g),S_FLIGHT
  • Actual
    • S(D);N_PINR(g),P_PINR(d)
    • Threat
      • S(D)
    • Vars
      • B(i);CHECK::B(H)+S(G)
      • K(c);N_SPINR(d),OGATEB,S_FLIGHT,XS(D)::QAB1(J),XP(e)
      • P(e);SBLOCK,XS(D)::B(H)+S(G)
      • B(i);S_CUTR(g)::B(H)+S(G)
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