MESON Chess Problem Database

Problem Display
PID: 202897 (1n4B1/1Q6/2nr2r1/1N3p2/2N1k1p1/2KpP1R1/4P3/8 w - - 0 1)

Richenberg, LJ

Woodward, LA

The Observer, 1951

(First published on Sun Feb 18 1951)

1n4B1/1Q6/2nr2r1/1N3p2/2N1k1p1/2KpP1R1/4P3/8

#2

8 + 8

15239 Valois Notebooks 2020

SOLUTION

  • SOUND
  • Sets
    • 1...Rdf6
      • 2.exd3#
    • 1...Rg5
      • 2.Sbxd6#
    • 1...Rg7
      • 2.Sbxd6#
  • Tries
    • 1.Rxg4+?
      • 1...Rxg4
        • 2.Sbxd6#
      • 1...f4
        • 2.Rxf4#
      • 1...fxg4!
    • 1.Qxc6+?
      • 1...Rd5
        • 2.Bxd5#
        • 2.Qxd5#
        • 2.exd3#
      • 1...Rxc6
        • 2.exd3#
      • 1...Sxc6!
  • Keys
    • 1.Qh7!
      • threat
        • 2.Qh1#
      • 1...f4
        • 2.Sbxd6#
      • 1...Rh6
        • 2.Rxg4#
      • 1...Sd4
        • 2.exd3#
      • 1...Se5
        • 2.Sd2#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 4
    • REMOVED MATES = 3
  • Sets
    • R(f);N_GUARD::P(A),XP(a)
    • R(g);N_GUARD::S(F),XR(f)
  • Tries
    • Try
      • R(D);CHECK,XP(c)
      • Vars
        • R(g);XR(D)::S(F),XR(f)
        • P(d);P_SPINP(d)::R1(D),XP(d)
      • Refutation
        • P(d);XR(D)
    • Try
      • Q(G);CHECK,XS(e)
      • Vars
        • R(f);P_PINS(E),XQ(G)::P(A),XP(a)
      • Refutation
        • S(h);XQ(G)
  • Actual
    • Q(G);N_PINS(e)
    • Threat
      • QAB(G)
    • Vars
      • P(d);P_SPINR(g)::S(F),XR(f)
      • R(g);N_GUARD,P_SPINP(d)::R(D),XP(c)
      • S(e);S_CUTR(f)::P(A),XP(a)
      • S(e);SBLOCK::S(E)
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