MESON Chess Problem Database

Problem Display
PID: 207925 (8/1p6/1Qp2K2/1PPkBp2/5r2/bP3R2/2n1nN2/3N4 w - - 0 1)

Pirnie, Duncan

The Observer, 1919

(First published on Sun Dec 21 1919)

8/1p6/1Qp2K2/1PPkBp2/5r2/bP3R2/2n1nN2/3N4

#2

9 + 8

15239 Valois Notebooks 2020

SOLUTION

  • SOUND
  • Sets
    • 1...Sa1
      • 2.Se3#
    • 1...Se1
      • 2.Se3#
    • 1...Se3
      • 2.Sxe3#
    • 1...Sb4
      • 2.Se3#
    • 1...Scd4
      • 2.Se3#
    • 1...Sc1
      • 2.Sc3#
    • 1...Sg1
      • 2.Sc3#
    • 1...Sc3
      • 2.Sxc3#
    • 1...Sg3
      • 2.Sc3#
    • 1...Sed4
      • 2.Sc3#
    • 1...cxb5
      • 2.Qd6#
  • Tries
    • 1.Rc3?
      • threat
        • 2.Qd8#
      • 1...Bxc5
        • 2.Rxc5#
        • 2.Qxc5#
      • 1...Sxc3
        • 2.Sxc3#
      • 1...cxb5
        • 2.Qd6#
        • 2.Qe6#
        • 2.Qxb7#
      • 1...Rc4
        • 2.bxc4#
      • 1...Rxf2!
    • 1.Rd3+?
      • 1...Scd4
        • 2.Se3#
      • 1...Sed4
        • 2.Sc3#
      • 1...Rd4!
    • 1.Qc7?
      • threat
        • 2.Qd6#
      • 1...Bxc5
        • 2.Qf7#
      • 1...Kxc5!
  • Keys
    • 1.Bd4!
      • threat
        • 2.Qd8#
      • 1...Kxd4
        • 2.Rd3#
      • 1...Rxd4
        • 2.Rxf5#
      • 1...Bxc5
        • 2.Qxc5#
      • 1...Scxd4
        • 2.Se3#
      • 1...Sexd4
        • 2.Sc3#
      • 1...cxb5
        • 2.Qd6#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 8
  • Sets
    • S(a);N_GUARD::S(A)
    • S(a);N_GUARD::S(A),XS(a)
    • S(b);N_GUARD::S(A)
    • S(b);N_GUARD::S(A),XS(b)
    • P(g);OGATE,XP(E)::QAR1(H)
  • Tries
    • Try
      • R(D);
      • Threat
        • QAR(H)
      • Vars
        • S(b);XR(D)::S(A),XS(b)
        • R(d);OGATE::P(C),XR(d)
      • Refutation
        • R(d);XS(B)
    • Try
      • R(D);CHECK
      • Vars
        • S(a);P_SPINS(a)::S(A)
        • S(b);P_SPINS(b)::S(A)
      • Refutation
        • R(d);P_SPINR(d)
    • Try
      • Q(H);
      • Threat
        • QAR1(H)
      • Vars
        • B(c);SBLOCK,XP(F)::QAB(H)
      • Refutation
        • K(e);P-FLIGHT,P_SPINP(g),XP(F)
  • Actual
    • B(G);
    • Threat
      • QAR(H)
    • Vars
      • K(e);OGATEB,P-FLIGHT,XB(G)::R1(D)
      • R(d);OGATE,SBLOCK,XB(G)::R(D),XP(f)
      • B(c);OGATE,XP(F)::QAR1(H),XB(c)
      • S(a);N_GUARD,SBLOCK,XB(G)::S(A)
      • S(b);N_GUARD,SBLOCK,XB(G)::S(A)
      • P(g);OGATE,XP(E)::QAR1(H)
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