MESON Chess Problem Database

Problem Display
PID: 187122 (K7/3p4/B2pR3/3NN2n/1P1k1r1R/2p2Q2/5n2/7b w - - 0 1)

Virgin, Eric Otto Gunnarsson

The Observer, 1934

(First published on Sun Sep 9 1934)

K7/3p4/B2pR3/3NN2n/1P1k1r1R/2p2Q2/5n2/7b

#2

8 + 8

15239 Valois Notebooks 2019

SOLUTION

  • SOUND
  • Sets
    • 1...Sd1
      • 2.Qd3#
    • 1...Sd3
      • 2.Qxd3#
    • 1...Sh3
      • 2.Qd3#
    • 1...Se4
      • 2.Qd3#
    • 1...Sg4
      • 2.Qd3#
    • 1...dxe6
      • 2.Sc6#
  • Tries
    • 1.Sxf4?
      • threat
        • 2.Se2#
      • 1...Bxf3+
        • 2.Sxf3#
      • 1...dxe6
        • 2.Sc6#
      • 1...Se4
        • 2.Qd3#
      • 1...Sxf4!
    • 1.Rxf4+?
      • 1...Se4
        • 2.Qd1#
        • 2.Qd3#
      • 1...Sxf4!
  • Keys
    • 1.Sc7!
      • threat
        • 2.Sb5#
      • 1...Bxf3+
        • 2.Sxf3#
      • 1...dxe5
        • 2.Rd6#
      • 1...dxe6
        • 2.Sc6#
      • 1...Re4
        • 2.Qxf2#
      • 1...Se4
        • 2.Qd3#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 4
  • Sets
    • S(b);N_GUARD::QAR1(A)
    • S(b);N_GUARD::QAR1(A),XS(b)
    • S(b);N_GUARD,N_SPINR(e)::QAR1(A)
    • P(h);N_GUARD,XR(G)::S(E)
  • Tries
    • Try
      • S(D);P_SPINQ(A),XR(e)
      • Threat
        • R(C)+S(D),DCHECK
      • Vars
        • B(a);CHECK,XQ(A)::S(E),XB(a)
        • P(h);N_GUARD,XR(G)::S(E)
        • S(b);N_PINQ(A)::QAR1(A)
      • Refutation
        • S(f);P_SPINS(f),XS(D)
    • Try
      • R(C);CHECK,XR(e)
      • Refutation
        • S(f);XR(C)
  • Actual
    • S(D);P_SPINQ(A)
    • Threat
      • S(D)
    • Vars
      • B(a);CHECK,XQ(A)::S(E),XB(a)
      • P(g);SBLOCK,XS(E)::R(G)
      • P(h);N_GUARD,XR(G)::S(E)
      • R(e);N_PINQ(A)::QAB(A),XS(b)
      • S(b);N_PINQ(A),N_SPINR(e)::QAR1(A)
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