MESON Chess Problem Database

Problem Display
PID: 33035 (1b2R2B/3n4/K1B1NP2/4k1P1/p5nR/Q3p3/4pq2/8 w - - 0 1)

Umnov, Evgeny Ivanovich

De Problemist, 1929

1b2R2B/3n4/K1B1NP2/4k1P1/p5nR/Q3p3/4pq2/8

#2

9 + 8

SOLUTION

  • SOUND
  • Sets
    • 1...Sh2
      • 2.Sd4#
      • 2.Sg7#
    • 1...Sgxf6
      • 2.Sd4#
    • 1...Sh6
      • 2.Sd4#
      • 2.Sg7#
    • 1...Sc5+
      • 2.Qxc5#
    • 1...Sdxf6
      • 2.Qc5#
    • 1...Sf8
      • 2.Qc5#
  • Tries
    • 1.Sd4+?
      • 1...Kxd4
        • 2.Re4#
      • 1...Kf4!
    • 1.Sg7+?
      • 1...Kd4
        • 2.Re4#
      • 1...Kf4!
    • 1.f7+?
      • 1...Kf5
        • 2.Qd3#
      • 1...Sgf6
        • 2.Sd4#
      • 1...Sdf6
        • 2.Qc5#
      • 1...Qf6!
  • Keys
    • 1.Qb4!
      • threat
        • 2.Sg7#
      • 1...Sc5+
        • 2.Qxc5#
      • 1...Kf5
        • 2.Qe4#
      • 1...Qxf6
        • 2.Qf4#
      • 1...Sgxf6
        • 2.Sd4#
      • 1...Sdxf6
        • 2.Qc5#
      • 1...Qf5
        • 2.Qd4#
      • 1...Bd6
        • 2.Qe4#
      • 1...Sf8
        • 2.Qc5#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 4
    • REMOVED MATES = 0
  • Sets
    • S(e);P_SPINS(e),XP(G)::R(H)+S(F)
    • S(g);CHECK,N_GUARD::QAR2(A),XS(g)
    • S(g);N_GUARD,P_SPINS(g),XP(G)::QAR2(A)
    • S(g);N_GUARD::QAR2(A)
  • Tries
    • Try
      • S(F);CHECK
      • Vars
        • K(f);OGATE,P_SPINS(e),S_FLIGHT,XS(F)::R1(H)
      • Refutation
        • K(f);P_SPINS(e),S_FLIGHT
    • Try
      • S(F);CHECK
      • Vars
        • K(f);OGATE,P_SPINS(e),S_FLIGHT::R1(H)
      • Refutation
        • K(f);P_SPINS(e),S_FLIGHT
    • Try
      • P(G);CHECK
      • Vars
        • K(f);P-FLIGHT::QAB(A)
        • S(e);P_SPINS(e)::R(H)+S(F)
        • S(g);P_SPINS(g)::QAR2(A)
      • Refutation
        • Q(b);P_SPINQ(b)
  • Actual
    • Q(A);
    • Threat
      • R(H)+S(F)
    • Vars
      • S(g);CHECK,N_GUARD::QAR2(A),XS(g)
      • K(f);P-FLIGHT::QAB1(A)
      • Q(b);N_GUARD,P_SPINQ(b),XP(G)::QAB1(A)
      • S(e);P_SPINS(e),XP(G)::R(H)+S(F)
      • S(g);N_GUARD,P_SPINS(g),XP(G)::QAR2(A)
      • Q(b);SBLOCK::QAB1(A)
      • B(h);SBLOCK::QAR1(A)
      • S(g);N_GUARD::QAR2(A)
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