MESON Chess Problem Database

Problem Display
PID: 180349 (8/8/8/8/2RpPN2/3B4/1N1kP3/n1n2KQ1 w - - 0 1)

Lider, Valentin Viktorovich

3rd Comm., Themes-64, 1980

8/8/8/8/2RpPN2/3B4/1N1kP3/n1n2KQ1

#2

8 + 4

6490 yacpdb 2018

SOLUTION

  • SOUND
  • Sets
    • 1...Sc2
      • 2.Rxc2#
    • 1...Sab3
      • 2.Rc2#
  • Tries
    • 1.Kf2?
      • threat
        • 2.Qxc1#
        • 2.Qd1#
        • 2.Qe1#
      • 1...Sxe2
        • 2.Qd1#
        • 2.Qe1#
      • 1...Sc2
        • 2.Rxc2#
        • 2.Qd1#
      • 1...Sab3
        • 2.Rc2#
        • 2.Qd1#
        • 2.Qe1#
      • 1...Sa2
        • 2.Qd1#
        • 2.Qe1#
      • 1...Scb3
        • 2.Qd1#
        • 2.Qe1#
      • 1...Sxd3+!
    • 1.Rxc1?
      • 1...Sc2
        • 2.Rxc2#
      • 1...Sb3
        • 2.Rc2#
      • 1...Kxc1!
    • 1.Qxd4?
      • 1...Sxe2
        • 2.Bxe2#
      • 1...Sxd3
        • 2.Qxd3#
      • 1...Sc2
        • 2.Rxc2#
      • 1...Sab3
        • 2.Rc2#
      • 1...Sa2
        • 2.Bb1#
      • 1...Scb3!
    • 1.Qg5?
      • threat
        • 2.Sg2#
        • 2.Sh3#
        • 2.Sd5#
        • 2.Sh5#
        • 2.Se6#
        • 2.Sg6#
      • 1...Ke3
        • 2.Sg2#
        • 2.Sh3#
        • 2.Sd5#
        • 2.Sh5#
        • 2.Se6#
        • 2.Sg6#
      • 1...Sxe2
        • 2.Sxe2#
      • 1...Sxd3
        • 2.Sfxd3#
      • 1...Sc2!
  • Keys
    • 1.Qf2!
      • 1...Sxe2
        • 2.Qxe2#
      • 1...Sxd3
        • 2.exd3#
      • 1...Sc2
        • 2.Rxc2#
      • 1...Sab3
        • 2.Rc2#
      • 1...Sa2
        • 2.e3#
      • 1...Scb3
        • 2.e3#

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 0
    • ADDED MATES = 4
    • REMOVED MATES = 0
  • Sets
    • S(a);N_GUARD::R1(F),XS(a)
    • S(a);N_GUARD::R1(F)
  • Tries
    • Try
      • K(A);P-FLIGHT
      • Threat
        • DUALS(3)
      • Refutation
        • S(b);CHECK,XB(E)
    • Try
      • R(F);XS(b)
      • Vars
        • S(a);N_GUARD::R1(F),XS(a)
        • S(a);N_GUARD::R1(F)
      • Refutation
        • K(c);S_FLIGHT,XR(F)
    • Try
      • Q(B);XP(d)
      • Vars
        • S(b);OGATE,XP(D)::QAR(B)+B(E),XS(b)
        • S(b);OGATE,P_SPINS(b),XB(E)::QAR1(B),XS(b)
        • S(a);N_GUARD::R1(F),XS(a)
        • S(a);N_GUARD::R1(F)
        • S(b);N_GUARD::QAR(B)+B(E)
      • Refutation
        • S(b);
    • Try
      • Q(B);
      • Threat
        • DUALS(6)
      • Vars
        • S(b);XP(D)::QAB(B)+S(H),XS(b)
        • S(b);XB(E)::QAB(B)+S(H),XS(b)
      • Refutation
        • S(a);
  • Actual
    • Q(B);
    • Vars
      • S(b);OGATE,P_SPINS(b),XP(D)::QAR1(B),XS(b)
      • S(b);OGATE,XB(E)::QAR(B)+P(D),XS(b)
      • S(a);N_GUARD::R1(F),XS(a)
      • S(a);N_GUARD::R1(F)
      • S(b);N_GUARD::QAR(B)+P(D)
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