MESON Chess Problem Database

Problem Display
PID: 188340 (8/1K6/8/2p1p3/6N1/1Q1P1nB1/RnpkB1r1/1r3RN1 w - - 0 1)

Holroyd, GC

The Observer, 1937

(First published on Sun Mar 28 1937)

8/1K6/8/2p1p3/6N1/1Q1P1nB1/RnpkB1r1/1r3RN1

#2

9 + 8

15239 Valois Notebooks 2019

SOLUTION

  • SOUND
  • Sets
    • 1...Rxe2
      • 2.Sxf3#
    • 1...Sd1
      • 2.Rxc2#
    • 1...Sxd3
      • 2.Rxc2#
    • 1...Sa4
      • 2.Rxc2#
    • 1...Sc4
      • 2.Rxc2#
    • 1...c1S
      • 2.Rd1#
    • 1...c1B
      • 2.Rd1#
  • Keys
    • 1.d4!
      • threat
        • 2.Qe3#
      • 1...Rxe2
        • 2.Sxf3#
      • 1...cxd4
        • 2.Qb4#
      • 1...exd4
        • 2.Bf4#
      • 1...Sd1
        • 2.Rxc2#
      • 1...c1Q
        • 2.Qd3#
      • 1...c1S
        • 2.Rd1#
      • 1...c1B
        • 2.Rd1#
        • 2.Qd3#
      • 1...c1R
        • 2.Qd3#
      • 1...Sd3
        • 2.Rxc2#
      • 1...Sa4
        • 2.Rxc2#
      • 1...Sc4
        • 2.Rxc2#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 4
    • REMOVED MATES = 1
  • Sets
    • R(e);SBLOCK,XB(D)::S(B),XS(f)
    • S(b);OGATE,P_PINQ(E),P_SPINP(c)::R1(C),XP(c)
    • S(b);OGATE,P_PINQ(E),P_SPINP(c),XP(F)::R1(C),XP(c)
    • P(c);N_GUARD,P_SPINS(b),S_CUTR(a)::R1(A)
  • Actual
    • P(F);
    • Threat
      • QAB1(E)
    • Vars
      • R(e);SBLOCK,XB(D)::S(B),XS(f)
      • P(g);N_GUARD,XP(F)::QAB(E)
      • P(h);N_GUARD,XP(F)::B(G)
      • S(b);OGATE,P_PINQ(E),P_SPINP(c)::R1(C),XP(c)
      • P(c);P_SPINS(b)::QAR1(E)
      • P(c);N_GUARD,P_SPINS(b),S_CUTR(a)::R1(A)
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