MESON Chess Problem Database

Problem Display
PID: 97 (4R2b/B1p5/3pN1pq/5p2/2BP3r/3Nk3/1Q2Pp2/2K2n2 w - - 0 1)

Isaev, Leonid Antonovich

Shakhmatny Listok, 1930

4R2b/B1p5/3pN1pq/5p2/2BP3r/3Nk3/1Q2Pp2/2K2n2

#2

9 + 10

5862 An ABC of Chess Problems 1970

SOLUTION

  • SOUND
  • Sets
    • 1...Ke4+
      • 2.Sg5#
    • 1...Rh1
      • 2.Sg7#
    • 1...Rh2
      • 2.Sg7#
    • 1...Rh3
      • 2.Sg7#
    • 1...Rxd4
      • 2.Sg7#
    • 1...Rh5
      • 2.Sg7#
    • 1...Bxd4
      • 2.Sef4#
    • 1...f4
      • 2.Sg7#
  • Tries
    • 1.Sxc7+?
      • 1...Re4
        • 2.Sd5#
      • 1...Be5!
    • 1.Qd2+?
      • 1...Ke4
        • 2.Sxf2#
        • 2.Sg5#
        • 2.Sg7#
      • 1...Sxd2!
    • 1.d5+?
      • 1...Ke4+
        • 2.Sg5#
      • 1...Rd4
        • 2.Sg7#
      • 1...Bd4
        • 2.Sef4#
      • 1...c5!
  • Keys
    • 1.Qc3!
      • threat
        • 2.Sdc5#
      • 1...Kxe2+
        • 2.Sdf4#
      • 1...Ke4+
        • 2.Sg5#
      • 1...Rxd4
        • 2.Sg7#
      • 1...Bxd4
        • 2.Sef4#
      • 1...c5
        • 2.Sdxc5#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 2
    • REMOVED MATES = 5
  • Sets
    • K(c);CHECK,P-FLIGHT::R(I)+S(G),DCHECK
    • R(d);N_GUARD::R(I)+S(G)
    • R(d);N_GUARD,P_SPINR(d),XP(F)::R(I)+S(G)
    • B(j);N_GUARD,P_SPINB(j),XP(F)::R(I)+S(G)
    • P(e);S_CUTR(d)::R(I)+S(G)
  • Tries
    • Try
      • S(G);CHECK,XP(i)
      • Vars
        • R(d);P_SPINR(d)::S(G)
      • Refutation
        • B(j);P_SPINB(j)
    • Try
      • Q(B);CHECK
      • Refutation
        • S(a);XQ(B)
    • Try
      • P(F);CHECK
      • Vars
        • K(c);CHECK,P-FLIGHT::R(I)+S(G),DCHECK
        • R(d);P_SPINR(d)::R(I)+S(G)
        • B(j);P_SPINB(j)::R(I)+S(G)
      • Refutation
        • P(i);P_SPINP(i)
  • Actual
    • Q(B);
    • Threat
      • QAR(B)+S(D)
    • Vars
      • K(c);CHECK,P-FLIGHT,XP(C)::B(E)+S(D),DCHECK
      • K(c);CHECK,P-FLIGHT::R(I)+S(G),DCHECK
      • R(d);N_GUARD,P_SPINR(d),XP(F)::R(I)+S(G)
      • B(j);N_GUARD,P_SPINB(j),XP(F)::R(I)+S(G)
      • P(i);::QAR(B)+S(D),XP(i)
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