MESON Chess Problem Database

Problem Display
PID: 35898 (7q/BQp1R3/3pN1pb/5p2/3P3r/3Nk3/4P1Rn/2K5 w - - 0 1)

Isaev, Leonid Antonovich

1st Comm., BCF 001. Ty., 1929-1930

7q/BQp1R3/3pN1pb/5p2/3P3r/3Nk3/4P1Rn/2K5

#2

9 + 9

SOLUTION

  • SOUND
  • Sets
    • 1...Qxd4
      • 2.Sef4#
    • 1...Qa8
      • 2.Sef4#
    • 1...Qb8
      • 2.Sef4#
    • 1...Rh3
      • 2.Sg7#
    • 1...Rxd4
      • 2.Sg7#
    • 1...Rh5
      • 2.Sg7#
    • 1...Sf1
      • 2.Qf3#
    • 1...Sf3
      • 2.Qxf3#
    • 1...Sg4
      • 2.Qf3#
    • 1...f4
      • 2.Sg7#
  • Tries
    • 1.Sxc7+?
      • 1...Re4
        • 2.Sd5#
      • 1...Qe5!
    • 1.Rg3+?
      • 1...Sf3
        • 2.Qxf3#
      • 1...Kxe2+!
    • 1.d5+?
      • 1...Ke4+
        • 2.Sg5#
      • 1...Qd4
        • 2.Sef4#
      • 1...Rd4
        • 2.Sg7#
      • 1...c5!
  • Keys
    • 1.Qb3!
      • threat
        • 2.Sdc5#
      • 1...Ke4+
        • 2.Sg5#
      • 1...Qxd4
        • 2.Sef4#
      • 1...Rxd4
        • 2.Sg7#
      • 1...Qb8
        • 2.Sef4#
      • 1...c5
        • 2.Sdxc5#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 2
    • REMOVED MATES = 7
  • Sets
    • Q(i);N_GUARD,P_SPINQ(i),XP(E)::R(I)+S(F)
    • Q(i);N_GUARD::R(I)+S(F)
    • R(c);N_GUARD::R(I)+S(F)
    • R(c);N_GUARD,P_SPINR(c),XP(E)::R(I)+S(F)
    • S(a);N_GUARD::QAR1(H)
    • S(a);N_GUARD::QAR1(H),XS(a)
    • P(d);S_CUTR(c)::R(I)+S(F)
  • Tries
    • Try
      • S(F);CHECK,XP(h)
      • Vars
        • R(c);P_SPINR(c)::S(F)
      • Refutation
        • Q(i);P_SPINQ(i)
    • Try
      • R(C);CHECK
      • Vars
        • S(a);N_GUARD,P_SPINS(a)::QAR1(H),XS(a)
      • Refutation
        • K(b);CHECK,P-FLIGHT,XP(B)
    • Try
      • P(E);CHECK
      • Vars
        • K(b);CHECK,P-FLIGHT::R(I)+S(F),DCHECK
        • Q(i);P_SPINQ(i)::R(I)+S(F)
        • R(c);P_SPINR(c)::R(I)+S(F)
      • Refutation
        • P(h);P_SPINP(h)
  • Actual
    • Q(H);
    • Threat
      • QAR(H)+S(D)
    • Vars
      • K(b);CHECK,P-FLIGHT::R(I)+S(F),DCHECK
      • Q(i);N_GUARD,P_SPINQ(i),XP(E)::R(I)+S(F)
      • R(c);N_GUARD,P_SPINR(c),XP(E)::R(I)+S(F)
      • Q(i);N_GUARD::R(I)+S(F)
      • P(h);::QAR(H)+S(D),XP(h)
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