MESON Chess Problem Database

Problem Display
PID: 208920 (5n2/8/bp1R4/b3kp2/4N2p/n2P3K/BNp5/4BQ2 w - - 0 1)

Andrew, Frederick William

The Observer, 1920

(First published on Sun Mar 28 1920)

5n2/8/bp1R4/b3kp2/4N2p/n2P3K/BNp5/4BQ2

#2

8 + 9

15239 Valois Notebooks 2020

SOLUTION

  • SOUND
  • Sets
    • 1...Bc3
      • 2.Bxc3#
    • 1...Sb5
      • 2.Sc4#
    • 1...Se6
      • 2.Rd5#
    • 1...fxe4
      • 2.Qf6#
  • Tries
    • 1.Bg3+?
      • 1...f4
        • 2.Qxf4#
      • 1...hxg3!
    • 1.Re6+?
      • 1...Kd4
        • 2.Bf2#
        • 2.Qg1#
        • 2.Qf2#
      • 1...Sxe6!
  • Keys
    • 1.Qf3!
      • threat
        • 2.d4#
      • 1...Bxd3
        • 2.Sxd3#
      • 1...fxe4
        • 2.Qf6#
      • 1...f4
        • 2.Qh5#
      • 1...Bc3
        • 2.Bxc3#
      • 1...Sb5
        • 2.Sc4#
      • 1...Se6
        • 2.Rd5#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 2
    • REMOVED MATES = 0
  • Sets
    • B(d);N_GUARD::B(A),XB(d)
    • S(b);N_GUARD,S_CUTB(g)::S(D)
    • S(i);SBLOCK::R1(H)
    • P(f);OGATE,XS(G)::QAB1(B)
  • Tries
    • Try
      • B(A);CHECK
      • Vars
        • P(f);P_SPINP(f)::QAB1(B),XP(f)
      • Refutation
        • P(c);XB(A)
    • Try
      • R(H);CHECK
      • Refutation
        • S(i);XR(H)
  • Actual
    • Q(B);
    • Threat
      • P(E)
    • Vars
      • B(g);XP(E)::S(D),XB(g)
      • P(f);OGATE,XS(G)::QAB1(B)
      • P(f);OGATEB,SBLOCK::QAR(B)
      • B(d);N_GUARD::B(A),XB(d)
      • S(b);N_GUARD,S_CUTB(g)::S(D)
      • S(i);SBLOCK::R1(H)
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