MESON Chess Problem Database

Problem Display
PID: 22743 (8/8/2N5/1nr5/1BQ5/2q5/1Pkp1N2/K2R4 w - - 0 1)

Kopaev, Viacheslav Georgievich

The Problemist, 1998

8/8/2N5/1nr5/1BQ5/2q5/1Pkp1N2/K2R4

#2

7 + 5

SOLUTION

  • SOUND
  • Sets
    • 1...Sa3
      • 2.Sd4#
    • 1...Sd4
      • 2.Sxd4#
    • 1...Sd6
      • 2.Sd4#
    • 1...Sa7
      • 2.Sd4#
    • 1...Sc7
      • 2.Sd4#
  • Tries
    • 1.Bxc3?
      • threat
        • 2.Sb4#
        • 2.Qa4#
      • 1...Rxc6
        • 2.Qa4#
      • 1...Sxc3
        • 2.Sb4#
        • 2.Sd4#
      • 1...Sd4
        • 2.Sb4#
        • 2.Sxd4#
      • 1...Rxc4!
    • 1.Qxc3+?
      • 1...Sxc3
        • 2.Sd4#
      • 1...Rxc3!
    • 1.Qe4+?
      • 1...Qd3
        • 2.Qxd3#
      • 1...Kb3!
    • 1.bxc3?
      • threat
        • 2.Qa2#
      • 1...Sxc3
        • 2.Sd4#
      • 1...Rxc4!
  • Keys
    • 1.Qa2!
      • threat
        • 2.bxc3#
      • 1...Qxb2+
        • 2.Qxb2#
      • 1...Qxb4
        • 2.Sxb4#
      • 1...Qd4
        • 2.Qa4#
      • 1...Qe5
        • 2.Qa4#
      • 1...Qf6
        • 2.Qa4#
      • 1...Qg7
        • 2.Qa4#
      • 1...Qh8
        • 2.Qa4#
      • 1...Qa3
        • 2.bxa3#
      • 1...Qb3
        • 2.Qb1#
      • 1...Qd3
        • 2.b3#
      • 1...Qe3
        • 2.b3#
      • 1...Qf3
        • 2.b3#
      • 1...Qg3
        • 2.b3#
      • 1...Qh3
        • 2.b3#
      • 1...Qc4
        • 2.b3#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 15
    • REMOVED MATES = 5
  • Sets
    • S(d);N_GUARD::S(G)
    • S(d);N_GUARD::S(G),XS(d)
  • Tries
    • Try
      • B(E);N_SPINP(C),XQ(c)
      • Threat
        • DUALS(2)
      • Vars
        • R(e);XS(G)::QAB(F)
      • Refutation
        • R(e);XQ(F)
    • Try
      • Q(F);CHECK,N_SPINP(C),XQ(c)
      • Vars
        • S(d);XQ(F)::S(G)
      • Refutation
        • R(e);XQ(F)
    • Try
      • Q(F);CHECK,N_PINQ(c)
      • Vars
        • Q(c);N_GUARD,N_PINP(C),P_SPINQ(c)::QAB1(F),XQ(c)
      • Refutation
        • K(a);S_FLIGHT
    • Try
      • P(C);N_SPINP(C),XQ(c)
      • Threat
        • QAR2(F)
      • Vars
        • S(d);N_GUARD,P_SPINS(d),XP(C)::S(G)
      • Refutation
        • R(e);XQ(F)
  • Actual
    • Q(F);N_PINQ(c)
    • Threat
      • QAR(F)+P(C),XQ(c)
    • Vars
      • Q(c);CHECK,OGATE,P_SPINQ(c),XP(C)::QAR1(F),XQ(c)
      • Q(c);N_PINP(C),XB(E)::S(G),XQ(c)
      • Q(c);N_GUARD::QAB(F)
      • Q(c);N_PINP(C),P_PINQ(F)::QAR(F)+P(C),XQ(c)
      • Q(c);N_PINP(C),SBLOCK::QAB1(F)
      • Q(c);N_PINP(C)::QAR(F)+P(C)
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