MESON Chess Problem Database

Problem Display
PID: 147234 (2r5/b2QN1B1/K1p3p1/p3N2p/4k3/4Pp2/8/nb2R3 w - - 0 1)

Melnichenko, Viktor Oleksandrovich

Rudenko, Valentin Fedorovich

Canadian Chess Chat, 1983

2r5/b2QN1B1/K1p3p1/p3N2p/4k3/4Pp2/8/nb2R3

#2

7 + 10

SOLUTION

  • SOUND
  • Sets
    • 1...Ra8
      • 2.Qxc6#
    • 1...Rb8
      • 2.Qxc6#
    • 1...Re8
      • 2.Qxc6#
    • 1...Rf8
      • 2.Qxc6#
    • 1...Rg8
      • 2.Qxc6#
    • 1...Rh8
      • 2.Qxc6#
    • 1...Ba2
      • 2.Qd3#
    • 1...Bd3+
      • 2.Qxd3#
    • 1...Bd4
      • 2.Qxd4#
    • 1...Bb8
      • 2.Qd4#
    • 1...Sc2
      • 2.Qd3#
    • 1...h4
      • 2.Qg4#
    • 1...c5
      • 2.Qd5#
    • 1...g5
      • 2.Qf5#
  • Tries
    • 1.Sc4?
      • threat
        • 2.Sd2#
      • 1...Bxe3
        • 2.Qd4#
      • 1...Bd4
        • 2.Qxd4#
      • 1...Bd3
        • 2.Qe6#
      • 1...Sb3!
    • 1.Sf7?
      • threat
        • 2.Sg5#
      • 1...Bxe3
        • 2.Qd4#
      • 1...Bd4
        • 2.Qxd4#
      • 1...g5
        • 2.Sxg5#
        • 2.Qf5#
      • 1...Bd3+!
    • 1.Qd1?
      • threat
        • 2.Qxf3#
      • 1...Bd3+
        • 2.Qxd3#
      • 1...Bxe3
        • 2.Qa4#
      • 1...f2
        • 2.Qf3#
      • 1...Rf8!
    • 1.Qd6?
      • threat
        • 2.Qxg6#
      • 1...Bd3+
        • 2.Qxd3#
      • 1...Rf8
        • 2.Qxc6#
      • 1...g5
        • 2.Qg6#
      • 1...Bxe3!
  • Keys
    • 1.Qe6!
      • threat
        • 2.Qxg6#
      • 1...Bd3+
        • 2.Sc4#
      • 1...Bxe3
        • 2.Qc4#
      • 1...Rf8
        • 2.Qxc6#
      • 1...g5
        • 2.Qf5#
        • 2.Qg6#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 1
    • ADDED MATES = 1
    • REMOVED MATES = 12
  • Sets
    • R(j);N_GUARD::QAB(E),XP(g)
    • B(b);N_GUARD::QAB1(E)
    • B(b);CHECK,N_GUARD::QAB1(E),XB(b)
    • B(i);N_GUARD::QAR1(E),XB(i)
    • B(i);N_GUARD::QAR1(E)
    • S(a);S_CUTB(b)::QAB1(E)
    • P(f);N_GUARD::QAR2(E)
    • P(g);N_GUARD::QAB1(E)
    • P(h);N_GUARD::QAB1(E)
  • Tries
    • Try
      • S(C);
      • Threat
        • S(C)
      • Vars
        • B(i);N_GUARD,P_SPINB(i),XP(B)::QAR1(E)
        • B(i);N_GUARD::QAR1(E),XB(i)
        • B(b);P_PINS(C),SBLOCK::QAR2(E)
      • Refutation
        • S(a);
    • Try
      • S(C);
      • Threat
        • S(C)
      • Vars
        • B(i);N_GUARD,P_SPINB(i),XP(B)::QAR1(E)
        • B(i);N_GUARD::QAR1(E),XB(i)
      • Refutation
        • B(b);CHECK
    • Try
      • Q(E);
      • Threat
        • QAB1(E),XP(c)
      • Vars
        • B(b);CHECK,N_GUARD::QAB1(E),XB(b)
        • B(i);N_GUARD,P_SPINB(i),XP(B)::QAR(E)
        • P(c);::QAB1(E)
      • Refutation
        • R(j);
    • Try
      • Q(E);
      • Threat
        • QAB(E),XP(h)
      • Vars
        • B(b);CHECK,N_GUARD::QAB1(E),XB(b)
        • R(j);N_GUARD::QAB(E),XP(g)
        • P(h);::QAB(E)
      • Refutation
        • B(i);P_SPINB(i),XP(B)
  • Actual
    • Q(E);
    • Threat
      • QAB(E),XP(h)
    • Vars
      • B(b);CHECK,SBLOCK::QAR(E)+S(C)
      • B(i);N_GUARD,P_SPINB(i),XP(B)::QAR2(E)
      • R(j);N_GUARD::QAB(E),XP(g)
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