MESON Chess Problem Database

Problem Display
PID: 185815 (r7/1qB1Q3/2r5/4P3/p2b4/2k1p3/1NP1B3/RR1K4 w - - 0 1)

Kish, Alexander

The Observer, 1931

(First published on Sun Dec 13 1931)

r7/1qB1Q3/2r5/4P3/p2b4/2k1p3/1NP1B3/RR1K4

#2

9 + 7

15239 Valois Notebooks 2018

SOLUTION

  • SOUND
  • Sets
    • 1...Qa6
      • 2.Ra3#
      • 2.Qa3#
    • 1...Qc8
      • 2.Ra3#
      • 2.Qa3#
    • 1...Qa7
      • 2.Ra3#
      • 2.Qa3#
    • 1...Qxc7
      • 2.Ra3#
      • 2.Qa3#
    • 1...Rb8
      • 2.Sxa4#
    • 1...Rc8
      • 2.Sxa4#
    • 1...Rd8
      • 2.Sxa4#
    • 1...Re8
      • 2.Sxa4#
    • 1...Rf8
      • 2.Sxa4#
    • 1...Rg8
      • 2.Sxa4#
    • 1...Rh8
      • 2.Sxa4#
    • 1...Bxe5
      • 2.Bxe5#
  • Tries
    • 1.Ba5+?
      • 1...Qb4
        • 2.Sxa4#
        • 2.Bxb4#
        • 2.Ra3#
        • 2.Qxb4#
      • 1...Rxa5!
  • Keys
    • 1.Qh4!
      • threat
        • 2.Qe1#
      • 1...Kb4
        • 2.Sxa4#
      • 1...Bxe5
        • 2.Bxe5#
      • 1...Bc5
        • 2.Qc4#
      • 1...Bb6
        • 2.Ra3#
      • 1...Ba7
        • 2.Sxa4#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 4
    • REMOVED MATES = 7
  • Sets
    • R(g);N_GUARD::S(D),XP(c)
    • B(d);OGATE,XP(G)::B(H),XB(d)
  • Tries
    • Try
      • B(H);CHECK
      • Refutation
        • R(g);XB(H)
  • Actual
    • Q(I);
    • Threat
      • QAB(I)
    • Vars
      • K(a);P_SPINB(d),S_FLIGHT::R(B)+S(D),XP(c)
      • B(d);OGATE,XP(G)::B(H),XB(d)
      • B(d);OGATE::QAR1(I)
      • B(d);S_CUTQ(f)::R(A)
      • B(d);S_CUTR(g)::S(D),XP(c)
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