MESON Chess Problem Database

Problem Display
PID: 190289 (q2B4/3p2pb/Q1p2pp1/1r6/5kBP/1p5K/8/4RN2 w - - 0 1)

Woodward, LA

The Observer, 1938

(First published on Sun Feb 20 1938)

q2B4/3p2pb/Q1p2pp1/1r6/5kBP/1p5K/8/4RN2

#2

7 + 10

15239 Valois Notebooks 2019

SOLUTION

  • SOUND
  • Sets
    • 1...Ra5
      • 2.Qc4#
    • 1...Rf5
      • 2.Qc4#
    • 1...Rg5
      • 2.Qc4#
    • 1...Rh5
      • 2.Qc4#
    • 1...Rb6
      • 2.Qc4#
    • 1...Rb7
      • 2.Qc4#
    • 1...Rb8
      • 2.Qc4#
    • 1...c5
      • 2.Qd6#
    • 1...f5
      • 2.Bg5#
    • 1...d5
      • 2.Bc7#
  • Tries
    • 1.Sd2?
      • threat
        • 2.Re4#
      • 1...Rb4
        • 2.Qf1#
      • 1...Re5
        • 2.Qf1#
      • 1...c5
        • 2.Qd6#
      • 1...f5
        • 2.Bg5#
      • 1...d5
        • 2.Bc7#
      • 1...g5!
    • 1.Bc7+?
      • 1...Re5
        • 2.Qc4#
      • 1...d6!
    • 1.Qa4+?
      • 1...Rb4
        • 2.Qxb4#
      • 1...Qxa4!
  • Keys
    • 1.Sg3!
      • threat
        • 2.Re4#
      • 1...Rb4
        • 2.Qf1#
      • 1...Re5
        • 2.Qf1#
      • 1...c5
        • 2.Qd6#
      • 1...f5
        • 2.Bg5#
      • 1...g5
        • 2.Sh5#
      • 1...d5
        • 2.Bc7#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 7
  • Sets
    • R(c);OGATE::QAR(F)
    • R(c);OGATE,P_PINP(E)::QAR(F)
    • P(d);OGATE::QAB(F)
    • P(e);OGATE::B(G)
    • P(g);N_GUARD,S_CUTR(c)::B(G)
  • Tries
    • Try
      • S(B);
      • Threat
        • R1(A)
      • Vars
        • R(c);OGATE::QAR(F)
        • P(d);OGATE::QAB(F)
        • P(e);OGATE::B(G)
        • P(g);N_GUARD,S_CUTR(c)::B(G)
      • Refutation
        • P(f);
    • Try
      • B(G);CHECK
      • Vars
        • R(c);OGATE,P_SPINR(c)::QAR(F)
      • Refutation
        • P(g);P_SPINP(g)
    • Try
      • Q(F);CHECK
      • Vars
        • R(c);N_GUARD,P_SPINR(c)::QAR(F),XR(c)
      • Refutation
        • Q(j);XQ(F)
  • Actual
    • S(B);
    • Threat
      • R1(A)
    • Vars
      • R(c);OGATE::QAR(F)
      • P(d);OGATE::QAB(F)
      • P(e);OGATE::B(G)
      • P(f);N_GUARD,S_CUTR(c)::S(B)
      • P(g);N_GUARD,S_CUTR(c)::B(G)
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