MESON Chess Problem Database

Problem Display
PID: 60457 (8/8/2N5/1pq1N3/8/5R1K/B1kP4/1R2B3 w - - 0 1)

Chepizhni, Viktor Ivanovich

1st Comm., Arguelles JT, 1981

8/8/2N5/1pq1N3/8/5R1K/B1kP4/1R2B3

#2

8 + 3

5626 European Junior Chess Solving Championship 2003
5405 Chess Solving Yearbook 2003 2004
5454 Near Snap 2015

SOLUTION

  • SOUND
  • Sets
    • 1...Qg1
      • 2.Sb4#
      • 2.Rc3#
    • 1...Qf2
      • 2.Sb4#
      • 2.Rc3#
    • 1...Qa3
      • 2.Sd4#
    • 1...Qe3
      • 2.Sb4#
    • 1...Qb4
      • 2.Sxb4#
    • 1...Qd4
      • 2.Sxd4#
    • 1...Qb6
      • 2.Sb4#
      • 2.Rc3#
    • 1...Qd6
      • 2.Rc3#
    • 1...Qa7
      • 2.Sb4#
      • 2.Rc3#
    • 1...Qe7
      • 2.Sd4#
      • 2.Rc3#
    • 1...Qf8
      • 2.Sd4#
      • 2.Rc3#
    • 1...Qc3
      • 2.Rxc3#
    • 1...Qd5
      • 2.Sb4#
      • 2.Rc3#
    • 1...Qxe5
      • 2.Sb4#
  • Tries
    • 1.Rfb3?
      • threat
        • 2.R3b2#
      • 1...Qc3+
        • 2.Rxc3#
      • 1...Qxe5
        • 2.Sb4#
      • 1...Qa3
        • 2.Sd4#
      • 1...Qb4
        • 2.Sxb4#
      • 1...Qd4
        • 2.Sxd4#
      • 1...Qe3+!
  • Keys
    • 1.Rf2!
      • threat
        • 2.d4#
      • 1...Qa3+
        • 2.d3#
      • 1...Qe3+
        • 2.dxe3#
      • 1...Qc3+
        • 2.dxc3#
      • 1...Qxf2
        • 2.Sb4#
      • 1...Qxe5
        • 2.Sb4#
      • 1...Qb4
        • 2.Sxb4#
      • 1...Qd4
        • 2.Sxd4#
      • 1...Qf8
        • 2.Sd4#
      • 1...Qc4
        • 2.d3#

This anticipates 105548(1998)

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 3
    • ADDED MATES = 3
    • REMOVED MATES = 1
  • Sets
    • Q(c);N_GUARD,P_PINR(E)::S(H)
    • Q(c);N_GUARD::S(H),XQ(c)
    • Q(c);N_GUARD::R1(E)
    • Q(c);N_GUARD,P_PINR(E)::R1(E),XQ(c)
    • Q(c);N_GUARD,XS(G)::S(H)
  • Tries
    • Try
      • R(E);
      • Threat
        • R1(E)
      • Vars
        • Q(c);CHECK,N_GUARD::R1(E),XQ(c)
        • Q(c);N_GUARD,XS(G)::S(H)
        • Q(c);N_GUARD,P_PINR(E)::S(H)
        • Q(c);N_GUARD::S(H),XQ(c)
      • Refutation
        • Q(c);CHECK
  • Actual
    • R(E);
    • Threat
      • R(E)+P(D)
    • Vars
      • Q(c);CHECK,N_GUARD::R(E)+P(D)
      • Q(c);CHECK,OGATE::R(E)+P(D),XQ(c)
      • Q(c);N_GUARD,XR(E)::S(H)
      • Q(c);N_GUARD,XS(G)::S(H)
      • Q(c);N_GUARD::S(H),XQ(c)
      • Q(c);N_GUARD::S(H)
      • Q(c);N_GUARD::R(E)+P(D)
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