MESON Chess Problem Database

Problem Display
PID: 193 (4r3/p2r4/7B/K4P1p/1Q1Pk3/2R1N2q/B1P1R3/6N1 w - - 0 1)

Hartong, Jan

3rd Prize, Larsen TT, 1950

4r3/p2r4/7B/K4P1p/1Q1Pk3/2R1N2q/B1P1R3/6N1

#2

11 + 6

45 Schach 1951

SOLUTION

  • SOUND
  • Sets
    • 1...Qxf5+
      • 2.Sd5#
    • 1...Rd5+
      • 2.Bxd5#
    • 1...Rb7
      • 2.Bd5#
    • 1...Rc7
      • 2.Bd5#
    • 1...Rde7
      • 2.Bd5#
    • 1...Rf7
      • 2.Bd5#
    • 1...Rg7
      • 2.Bd5#
    • 1...Rh7
      • 2.Bd5#
    • 1...Re5+
      • 2.d5#
  • Tries
    • 1.Sf1+?
      • 1...Qe3
        • 2.Sg3#
      • 1...Kxf5!
    • 1.Qc4?
      • threat
        • 2.Qd3#
      • 1...Qxf5+
        • 2.Sd5#
      • 1...Rd5+
        • 2.Qxd5#
      • 1...Re5+
        • 2.d5#
      • 1...Rxd4!
  • Keys
    • 1.Qb5!
      • threat
        • 2.Qd3#
      • 1...Kxd4
        • 2.Rc4#
      • 1...Qxf5
        • 2.Sxf5#
      • 1...Rxd4
        • 2.Qxe8#
      • 1...Rd5
        • 2.Qxd5#
      • 1...Re5
        • 2.Qxe5#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 3
    • ADDED MATES = 2
    • REMOVED MATES = 6
  • Sets
    • Q(a);CHECK,N_GUARD,SBLOCK,XP(J)::R(D)+S(F)
    • R(e);CHECK,N_GUARD::B(B),XR(e)
    • R(e);N_GUARD::B(B)
    • R(f);CHECK,SBLOCK::QAR(G)+P(H)
  • Tries
    • Try
      • S(F);CHECK
      • Vars
        • Q(a);P_SPINQ(a)::S(F)
      • Refutation
        • K(b);S_FLIGHT,XP(J)
    • Try
      • Q(G);
      • Threat
        • QAB1(G)
      • Vars
        • Q(a);CHECK,N_GUARD,SBLOCK,XP(J)::R(D)+S(F)
        • R(e);CHECK,N_GUARD::QAB1(G),XR(e)
        • R(f);CHECK,SBLOCK::QAR(G)+P(H)
      • Refutation
        • R(e);P_SPINR(e),XP(H)
  • Actual
    • Q(G);
    • Threat
      • QAB1(G)
    • Vars
      • K(b);OGATEB,P-FLIGHT,XP(H)::R1(E)
      • Q(a);P_PINQ(G),XP(J)::R(D)+S(F),XQ(a)
      • R(e);OGATE,SBLOCK,XP(H)::QAR(G),XR(f)
      • R(e);N_GUARD,P_PINQ(G)::QAB1(G),XR(e)
      • R(f);N_GUARD,P_PINQ(G)::QAR1(G),XR(f)
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