MESON Chess Problem Database

Problem Display
PID: 187454 (8/4bN1n/3p4/3p4/5kNB/7r/2B2P2/2KQ3b w - - 0 1)

Jenkins, AF

The Observer, 1935

(First published on Sun Jun 2 1935)

8/4bN1n/3p4/3p4/5kNB/7r/2B2P2/2KQ3b

#2

7 + 7

15239 Valois Notebooks 2019

SOLUTION

  • SOUND
  • Sets
    • 1...Rh2
      • 2.Bg3#
    • 1...Re3
      • 2.fxe3#
    • 1...Rf3
      • 2.Qd4#
    • 1...Rg3
      • 2.Bxg3#
      • 2.fxg3#
    • 1...Sf6
      • 2.Bg5#
  • Tries
    • 1.Sge5?
      • threat
        • 2.Sg6#
        • 2.Qg4#
      • 1...Rxh4
        • 2.Sg6#
        • 2.Qd2#
      • 1...Rd3
        • 2.Qg4#
      • 1...Be4
        • 2.Qg4#
      • 1...Rf3
        • 2.Qd4#
      • 1...Rg3
        • 2.Bxg3#
      • 1...Bf3
        • 2.Qd2#
      • 1...Sf6
        • 2.Sg6#
        • 2.Bg5#
      • 1...Sf8
        • 2.Qg4#
      • 1...dxe5!
    • 1.Sgh6?
      • threat
        • 2.Qg4#
      • 1...Rf3
        • 2.Qd4#
      • 1...Rg3
        • 2.Bxg3#
      • 1...Bf3
        • 2.Qd2#
      • 1...Sf6
        • 2.Bg5#
      • 1...Rxh4!
  • Keys
    • 1.Sh2!
      • threat
        • 2.Qg4#
      • 1...Rxh2
        • 2.Bg3#
      • 1...Rxh4
        • 2.Qd2#
      • 1...Rf3
        • 2.Qd4#
      • 1...Rg3
        • 2.Bxg3#
      • 1...Bf3
        • 2.Qd2#
      • 1...Sf6
        • 2.Bg5#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 1
  • Sets
    • R(b);N_GUARD::B(F)
    • R(b);OGATE::P(D),XR(b)
    • R(b);SBLOCK,S_CUTB(a)::QAR2(B)
    • S(g);N_GUARD,S_CUTB(f)::B(F)
  • Tries
    • Try
      • S(E);
      • Threat
        • DUALS(2)
      • Vars
        • R(b);::QAR1(B)
        • B(a);::QAR1(B)
        • R(b);S_CUTB(a)::QAR2(B)
        • R(b);N_GUARD::B(F),XR(b)
        • B(a);S_CUTR(b)::QAB(B)
        • S(g);::QAR1(B)
      • Refutation
        • P(e);XS(E)
    • Try
      • S(E);
      • Threat
        • QAR1(B)
      • Vars
        • R(b);SBLOCK,S_CUTB(a)::QAR2(B)
        • R(b);N_GUARD::B(F),XR(b)
        • B(a);SBLOCK,S_CUTR(b)::QAB(B)
        • S(g);N_GUARD,S_CUTB(f)::B(F)
      • Refutation
        • R(b);XB(F)
  • Actual
    • S(E);
    • Threat
      • QAR1(B)
    • Vars
      • R(b);N_GUARD,XS(E)::B(F)
      • R(b);N_GUARD,XB(F)::QAB(B)
      • R(b);S_CUTB(a)::QAR2(B)
      • R(b);N_GUARD::B(F),XR(b)
      • B(a);S_CUTR(b)::QAB(B)
      • S(g);N_GUARD,S_CUTB(f)::B(F)
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