MESON Chess Problem Database

Problem Display
PID: 229289 (8/3pNR2/1Q2N1p1/4k3/8/4nK2/5B2/3r2r1 w - - 0 1)

Lebedkin, Elisey K

Pletenev, Nikolai Alexeyevich

US Problem Bulletin, 1987

8/3pNR2/1Q2N1p1/4k3/8/4nK2/5B2/3r2r1

#2

6 + 6

SOLUTION

  • SOUND
  • Sets
    • 1...Rd6
      • 2.Qxe3#
    • 1...Re1
      • 2.Bg3#
    • 1...Rh1
      • 2.Bg3#
    • 1...Rg3+
      • 2.Bxg3#
    • 1...d6
      • 2.Qxe3#
  • Tries
    • 1.Sg5?
      • threat
        • 2.Qf6#
      • 1...Rg3+
        • 2.Bxg3#
      • 1...Sd5
        • 2.Sxg6#
      • 1...Rd6
        • 2.Qxe3#
      • 1...d6
        • 2.Qxe3#
      • 1...Sg4!
    • 1.Sc7?
      • threat
        • 2.Qf6#
      • 1...Rg3+
        • 2.Bxg3#
      • 1...Sg4
        • 2.Sxg6#
      • 1...Rd6
        • 2.Qxe3#
      • 1...d6
        • 2.Sc6#
        • 2.Qxe3#
      • 1...Sd5!
    • 1.Qd4+?
      • 1...Kxe6
        • 2.Qf6#
      • 1...Rxd4!
  • Keys
    • 1.Sf8!
      • threat
        • 2.Qf6#
      • 1...Rg3+
        • 2.Bxg3#
      • 1...Sd5
        • 2.Sxd7#
      • 1...Rd6
        • 2.Qxe3#
      • 1...Sg4
        • 2.Sfxg6#
      • 1...d6
        • 2.Qxe3#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 2
    • REMOVED MATES = 2
  • Sets
    • R(a);SBLOCK::QAR2(C),XS(c)
    • R(b);N_GUARD::B(A)
    • R(b);CHECK,N_GUARD::B(A),XR(b)
    • P(f);SBLOCK::QAR2(C),XS(c)
  • Tries
    • Try
      • S(D);
      • Threat
        • QAB1(C)
      • Vars
        • R(b);CHECK,N_GUARD::B(A),XR(b)
        • S(c);SBLOCK::S(E),XP(e)
        • R(a);SBLOCK::QAR2(C),XS(c)
        • P(f);SBLOCK::QAR2(C),XS(c)
      • Refutation
        • S(c);
    • Try
      • S(D);
      • Threat
        • QAB1(C)
      • Vars
        • R(b);CHECK,N_GUARD::B(A),XR(b)
        • S(c);S_CUTR(b)::S(E),XP(e)
        • R(a);SBLOCK::QAR2(C),XS(c)
      • Refutation
        • S(c);
    • Try
      • Q(C);CHECK
      • Vars
        • K(d);OGATE,P-FLIGHT,XS(D)::QAR1(C)
      • Refutation
        • R(a);XQ(C)
  • Actual
    • S(D);
    • Threat
      • QAB1(C)
    • Vars
      • R(b);CHECK,N_GUARD::B(A),XR(b)
      • S(c);S_CUTR(a)::S(D),XP(f)
      • R(a);SBLOCK::QAR2(C),XS(c)
      • S(c);S_CUTR(b)::S(D),XP(e)
      • P(f);SBLOCK::QAR2(C),XS(c)
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