MESON Chess Problem Database

Problem Display
PID: 393 (3Q4/8/4R3/b1p5/b1r3r1/3R1B2/4P1p1/2B1k1K1 w - - 0 1)

Howard, Kenneth Samuel

The Observer, 1941

(First published on Sun Jul 13 1941)

3Q4/8/4R3/b1p5/b1r3r1/3R1B2/4P1p1/2B1k1K1

#2

7 + 7

5089 The Enjoyment of Chess Problems 1943
5088 How to Solve Chess Problems 1945
15239 Valois Notebooks 2019

SOLUTION

  • SOUND
  • Sets
    • 1...Rc2
      • 2.Rd1#
    • 1...Bd1
      • 2.Rxd1#
    • 1...Bb5
      • 2.Rd1#
    • 1...Bc6
      • 2.Rd1#
    • 1...Be8
      • 2.Rd1#
  • Tries
    • 1.Qh4+?
      • 1...Rg3
        • 2.Qxg3#
      • 1...Rxh4!
    • 1.Qxa5+?
      • 1...Rc3
        • 2.Qxc3#
      • 1...Rb4!
  • Keys
    • 1.e4!
      • threat
        • 2.Re3#
      • 1...Rcxe4
        • 2.Qxa5#
      • 1...Rgxe4
        • 2.Qh4#
      • 1...Rc2
        • 2.Rd1#
      • 1...Rc3
        • 2.Bd2#
      • 1...Bd1
        • 2.Rxd1#
      • 1...Bd2
        • 2.Bxd2#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 4
    • REMOVED MATES = 3
  • Sets
    • R(d);S_CUTB(c)::R1(D)
    • B(c);N_GUARD::R1(D),XB(c)
    • B(c);N_GUARD::R1(D)
  • Tries
    • Try
      • Q(G);CHECK
      • Vars
        • R(e);N_GUARD,P_SPINR(e)::QAB(G),XR(e)
      • Refutation
        • R(e);XQ(G)
    • Try
      • Q(G);CHECK,XB(f)
      • Vars
        • R(d);N_GUARD,P_SPINR(d)::QAB(G),XR(d)
      • Refutation
        • R(d);P_SPINR(d)
  • Actual
    • P(C);
    • Threat
      • R(D)
    • Vars
      • R(d);N_GUARD,P_SPINR(d),XP(C)::QAB(G),XB(f)
      • R(e);N_GUARD,P_SPINR(e),XP(C)::QAB(G)
      • R(d);S_CUTB(c)::R1(D)
      • R(d);S_CUTB(f)::B(A)
      • B(c);N_GUARD::R1(D),XB(c)
      • B(f);N_GUARD::B(A),XB(f)
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