MESON Chess Problem Database

Problem Display
PID: 207892 (1K2N3/8/3R4/1R6/P1k5/rr1nB1b1/3Pn3/1Q3B2 w - - 0 1)

Holladay, Edgar Dinwiddie

The Observer, 1955

(First published on Sun Jan 16 1955)

1K2N3/8/3R4/1R6/P1k5/rr1nB1b1/3Pn3/1Q3B2

#2

9 + 6

15239 Valois Notebooks 2020

SOLUTION

  • SOUND
  • Sets
    • 1...Ra1
      • 2.Qxb3#
    • 1...Ra2
      • 2.Qxb3#
    • 1...Rxa4
      • 2.Qxb3#
    • 1...Rxb5+
      • 2.Qxb5#
    • 1...Bxd6+
      • 2.Sxd6#
    • 1...Sc3
      • 2.Bxd3#
      • 2.Qxd3#
    • 1...Sef4
      • 2.Rd4#
      • 2.Rc6#
    • 1...Sc1
      • 2.Qe4#
    • 1...Se1
      • 2.Qe4#
    • 1...Sb2
      • 2.Qe4#
    • 1...Sb4
      • 2.Rc5#
      • 2.Qe4#
    • 1...Sdf4
      • 2.Rd4#
      • 2.Rc6#
      • 2.Qe4#
    • 1...Se5
      • 2.Rd4#
      • 2.Qe4#
  • Tries
    • 1.Qc2+?
      • 1...Sc3
        • 2.Bxd3#
        • 2.Qxd3#
      • 1...Rc3!
  • Keys
    • 1.Bg2!
      • threat
        • 2.Bd5#
      • 1...Rxb5+
        • 2.Qxb5#
      • 1...Bxd6+
        • 2.Sxd6#
      • 1...Rxa4
        • 2.Qxb3#
      • 1...Sc3
        • 2.Qxd3#
      • 1...Sef4
        • 2.Rd4#
      • 1...Sb4
        • 2.Rc5#
      • 1...Sdf4
        • 2.Rc6#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 4
    • REMOVED MATES = 5
  • Sets
    • R(b);N_GUARD::QAB1(A),XR(c)
    • R(b);N_GUARD,XP(E)::QAB1(A),XR(c)
    • R(c);CHECK,OGATE,P_PINR(G),XR(F)::QAB1(A),XR(c)
    • B(e);CHECK,XR(G)::S(I),XB(e)
    • S(d);OGATE,P_SPINS(a)::QAR2(A)
  • Tries
    • Try
      • Q(A);CHECK
      • Refutation
        • R(c);N_PINR(F),P_PINR(G),P_SPINR(c)
  • Actual
    • B(B);
    • Threat
      • B(B)
    • Vars
      • R(c);CHECK,OGATE,P_PINR(G),XR(F)::QAB1(A),XR(c)
      • B(e);CHECK,XR(G)::S(I),XB(e)
      • R(b);N_GUARD,XP(E)::QAB1(A),XR(c)
      • S(a);S_CUTR(c)::QAB1(A),XS(d)
      • S(a);OGATE::R1(G)
      • S(d);N_PINR(F),P_PINR(G),SBLOCK::R1(F)
      • S(d);OGATE::R(G)
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