MESON Chess Problem Database

Problem Display
PID: 180462 (2K1R3/8/3p4/nQPk2p1/n7/2P5/3PN3/3R4 w - - 0 1)

Lider, Valentin Viktorovich

5th HM., Problemas, 1976

2K1R3/8/3p4/nQPk2p1/n7/2P5/3PN3/3R4

#2

8 + 5

6490 yacpdb 2018

SOLUTION

  • SOUND
  • Sets
    • 1...Sb2
      • 2.c6#
    • 1...Sxc3
      • 2.dxc3#
    • 1...Sb6+
      • 2.cxb6#
    • 1...Sb3
      • 2.c4#
    • 1...Sc6
      • 2.c4#
    • 1...Sb7
      • 2.c4#
    • 1...g4
      • 2.Sf4#
  • Tries
    • 1.Kc7?
      • 1...Sxc3
        • 2.dxc3#
      • 1...dxc5
        • 2.Qd3#
      • 1...Sb2
        • 2.cxd6#
        • 2.c6#
      • 1...Sb6
        • 2.cxb6#
        • 2.cxd6#
        • 2.c6#
      • 1...Sb3
        • 2.c4#
      • 1...Sc4
        • 2.Qc6#
      • 1...Sc6
        • 2.c4#
      • 1...Sb7
        • 2.c4#
      • 1...g4
        • 2.Sf4#
      • 1...Sxc5!
    • 1.Kd7?
      • 1...Sb6+
        • 2.cxb6#
      • 1...Sxc3
        • 2.dxc3#
      • 1...dxc5
        • 2.Qd3#
      • 1...Sb2
        • 2.cxd6#
        • 2.c6#
      • 1...Sb3
        • 2.c4#
      • 1...Sc4
        • 2.Qc6#
      • 1...Sc6
        • 2.c4#
      • 1...Sb7
        • 2.c4#
      • 1...g4
        • 2.Sf4#
      • 1...Sxc5+!
  • Keys
    • 1.d4!
      • 1...Sb6+
        • 2.cxb6#
      • 1...Sxc3
        • 2.Sxc3#
      • 1...Sxc5
        • 2.dxc5#
      • 1...dxc5
        • 2.dxc5#
      • 1...Sc4
        • 2.Qb7#
      • 1...Sb2
        • 2.c6#
      • 1...Sb3
        • 2.c4#
      • 1...Sc6
        • 2.Qb3#
        • 2.c4#
      • 1...Sb7
        • 2.c4#
      • 1...g4
        • 2.Sf4#

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 1
    • ADDED MATES = 3
    • REMOVED MATES = 1
  • Sets
    • S(a);N_GUARD::QAR(E)+P(F)
    • S(a);OGATE,XP(D)::R(A)+P(B),XS(a)
    • S(a);CHECK,OGATE::QAR(E)+P(F),XS(a)
    • S(b);N_GUARD::P(D)
    • P(d);N_GUARD::S(C)
  • Tries
    • Try
      • K(G);P-FLIGHT
      • Vars
        • S(a);OGATE,XP(D)::R(A)+P(B),XS(a)
        • P(e);P_SPINP(e),SBLOCK,XP(F)::QAR2(E)
        • S(b);N_GUARD::P(D)
        • S(b);N_GUARD,SBLOCK::QAB1(E)
        • P(d);N_GUARD::S(C)
      • Refutation
        • S(a);P_SPINS(a),XP(F)
    • Try
      • K(G);S_FLIGHT
      • Vars
        • S(a);CHECK,OGATE::QAR(E)+P(F),XS(a)
        • S(a);OGATE,XP(D)::R(A)+P(B),XS(a)
        • P(e);P_SPINP(e),SBLOCK,XP(F)::QAR2(E)
        • S(b);N_GUARD::P(D)
        • S(b);N_GUARD,SBLOCK::QAB1(E)
        • P(d);N_GUARD::S(C)
      • Refutation
        • S(a);CHECK,P_SPINS(a),XP(F)
  • Actual
    • P(B);
    • Vars
      • S(a);CHECK,OGATE::QAR(E)+P(F),XS(a)
      • S(a);XP(D)::S(C),XS(a)
      • S(a);OGATE,P_SPINS(a),XP(F)::R(A)+P(B),XS(a)
      • P(e);OGATE,P_SPINP(e),XP(F)::R(A)+P(B),XP(e)
      • S(b);N_GUARD,SBLOCK::QAB(E)
      • S(a);N_GUARD::QAR(E)+P(F)
      • S(b);N_GUARD::P(D)
      • P(d);N_GUARD::S(C)
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