MESON Chess Problem Database

Problem Display
PID: 18086 (2n2Br1/8/bpQ2PB1/1P2kN2/1R4p1/1pp2R2/3bK2p/1q1nN3 w - - 0 1)

Hjelle, David

4th HM., Israel Ring Ty., 1953

2n2Br1/8/bpQ2PB1/1P2kN2/1R4p1/1pp2R2/3bK2p/1q1nN3

#2

10 + 12

5978 Jerusalem Post 1953

SOLUTION

  • SOUND
  • Sets
    • 1...Qa2
      • 2.Sd3#
      • 2.Re4#
    • 1...Qd3+
      • 2.Sxd3#
    • 1...Qe4+
      • 2.Rxe4#
    • 1...Qxf5
      • 2.Rxf5#
    • 1...Qa1
      • 2.Sd3#
      • 2.Re4#
    • 1...Qc1
      • 2.Sd3#
      • 2.Re4#
    • 1...Qb2
      • 2.Sd3#
      • 2.Re4#
    • 1...Bxb5+
      • 2.Rxb5#
    • 1...Sd6
      • 2.Qxd6#
    • 1...Sa7
      • 2.Qd6#
    • 1...Se7
      • 2.Qd6#
    • 1...c2
      • 2.Sd3#
      • 2.Re4#
    • 1...gxf3+
      • 2.Sxf3#
  • Tries
    • 1.Sg7?
      • threat
        • 2.Qe6#
      • 1...Qd3+
        • 2.Sxd3#
      • 1...Qe4+
        • 2.Rxe4#
        • 2.Qxe4#
      • 1...Bxb5+
        • 2.Qxb5#
      • 1...gxf3+
        • 2.Sxf3#
      • 1...Qf5
        • 2.Rxf5#
      • 1...Sd6
        • 2.Bxd6#
        • 2.Qxd6#
      • 1...Rxg7!
    • 1.Bd6+?
      • 1...Ke6
        • 2.Sd4#
      • 1...Sxd6
        • 2.Qxd6#
      • 1...Kxf6!
  • Keys
    • 1.Sd4!
      • threat
        • 2.Qe6#
      • 1...Qd3+
        • 2.Sxd3#
      • 1...Qe4+
        • 2.Qxe4#
      • 1...Bxb5+
        • 2.Qxb5#
      • 1...gxf3+
        • 2.Sdxf3#
      • 1...Qf5
        • 2.Rxf5#
      • 1...Sd6
        • 2.Bxd6#
        • 2.Qxd6#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 2
    • ADDED MATES = 0
    • REMOVED MATES = 3
  • Sets
    • Q(a);CHECK,N_GUARD,N_PINP(E)::S(A),XQ(a)
    • Q(a);CHECK,N_GUARD::R1(D),XQ(a)
    • Q(a);OGATE,XS(F)::R1(C),XQ(a)
    • B(i);CHECK,OGATE,XP(E)::R(D),XB(i)
    • S(k);N_GUARD::QAB1(G),XS(k)
    • S(k);N_GUARD::QAB1(G)
    • P(g);CHECK,XR(C)::S(A),XP(g)
  • Tries
    • Try
      • S(F);
      • Threat
        • QAR1(G)
      • Vars
        • Q(a);CHECK,N_GUARD,N_PINP(E)::S(A),XQ(a)
        • B(i);CHECK,OGATE,XP(E)::QAR(G),XB(i)
        • P(g);CHECK,XR(C)::S(A),XP(g)
        • Q(a);N_GUARD::R1(C),XQ(a)
      • Refutation
        • R(l);XS(F)
    • Try
      • B(J);CHECK
      • Vars
        • K(h);P-FLIGHT::S(F)
        • S(k);OGATE,XB(J)::QAB1(G),XS(k)
      • Refutation
        • K(h);S_FLIGHT,XP(H)
  • Actual
    • S(F);
    • Threat
      • QAR1(G)
    • Vars
      • Q(a);CHECK,N_GUARD,N_PINP(E)::S(A),XQ(a)
      • Q(a);CHECK,N_GUARD::QAR1(G),XQ(a)
      • B(i);CHECK,OGATE,XP(E)::QAR(G),XB(i)
      • P(g);CHECK,XR(C)::S(F),XP(g)
      • Q(a);N_GUARD::R1(C),XQ(a)
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