MESON Chess Problem Database

Problem Display
PID: 198988 (8/2pp4/1p6/1QPk1B2/2p5/2Kn1N2/3R1Pn1/3N4 w - - 0 1)

Fenner, A Jack

The Observer, 1945

(First published on Sun Jan 14 1945)

8/2pp4/1p6/1QPk1B2/2p5/2Kn1N2/3R1Pn1/3N4

#2

8 + 7

15239 Valois Notebooks 2019

SOLUTION

  • SOUND
  • Sets
    • 1...Se1
      • 2.Se3#
    • 1...Se3
      • 2.Sxe3#
    • 1...Sf4
      • 2.Se3#
    • 1...Sh4
      • 2.Se3#
    • 1...bxc5
      • 2.Qxd7#
    • 1...c6
      • 2.Qxc4#
    • 1...d6
      • 2.c6#
  • Tries
    • 1.Kc2?
      • threat
        • 2.Sc3#
      • 1...Se3+
        • 2.Sxe3#
      • 1...bxc5
        • 2.Qxd7#
      • 1...c3
        • 2.Sxc3#
        • 2.Rxd3#
      • 1...Se1+!
    • 1.Bxd7?
      • threat
        • 2.Qxc4#
        • 2.Qc6#
      • 1...bxc5
        • 2.Qc6#
      • 1...Se3
        • 2.Qc6#
      • 1...c6
        • 2.Qxc4#
        • 2.Qxc6#
      • 1...Ke4!
    • 1.cxb6+?
      • 1...c5
        • 2.Qxd7#
      • 1...Kd6!
  • Keys
    • 1.Re2!
      • 1...Sxf2
        • 2.Re5#
      • 1...Sxc5
        • 2.Rd2#
      • 1...bxc5
        • 2.Qxd7#
      • 1...Sge1
        • 2.Se3#
      • 1...Se3
        • 2.Sxe3#
      • 1...Sgf4
        • 2.Se3#
      • 1...Sh4
        • 2.Se3#
      • 1...Sc1
        • 2.Re5#
      • 1...Sde1
        • 2.Re5#
      • 1...Sb2
        • 2.Re5#
      • 1...Sb4
        • 2.Re5#
      • 1...Sdf4
        • 2.Re5#
      • 1...Se5
        • 2.Rxe5#
      • 1...c6
        • 2.Qxc4#
      • 1...d6
        • 2.Be6#

FEATURES

  • Static
    • TYPE = MUTATE
    • CHANGED MATES = 1
    • ADDED MATES = 8
    • REMOVED MATES = 0
  • Sets
    • S(a);N_GUARD::S(A)
    • S(a);N_GUARD::S(A),XS(a)
    • P(e);P_SPINP(e),SBLOCK,XP(G)::QAR2(F),XP(g)
    • P(f);SBLOCK::QAB1(F),XP(c)
    • P(g);SBLOCK::QAR(F)+P(G)
  • Tries
    • Try
      • K(D);P-FLIGHT
      • Threat
        • S(A)
      • Vars
        • S(a);CHECK,N_GUARD::S(A),XS(a)
        • P(e);P_SPINP(e),SBLOCK,XP(G)::QAR2(F),XP(g)
      • Refutation
        • S(a);CHECK
    • Try
      • B(H);XP(g)
      • Threat
        • DUALS(2)
      • Vars
        • P(e);P_SPINP(e),XP(G)::QAB1(F)
        • S(a);::QAB1(F)
      • Refutation
        • K(d);N_SPINS(b),S_FLIGHT
    • Try
      • P(G);CHECK,XP(e)
      • Vars
        • P(f);P_SPINP(f),SBLOCK::QAR2(F),XP(g)
      • Refutation
        • K(d);P-FLIGHT
  • Actual
    • R(B);N_PINS(b)
    • Vars
      • S(b);N_GUARD,XP(C)::R1(B)
      • S(b);OGATEB,P_SPINS(b),XP(G)::R(B)
      • P(e);P_SPINP(e),SBLOCK,XP(G)::QAR2(F),XP(g)
      • S(a);N_GUARD::S(A)
      • S(a);N_GUARD::S(A),XS(a)
      • S(b);N_GUARD::R1(B)
      • S(b);N_GUARD::R1(B),XS(b)
      • P(f);SBLOCK::QAB1(F),XP(c)
      • P(g);N_GUARD::B(H)
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