MESON Chess Problem Database

Problem Display
PID: 241134 (8/3p4/1p1Q1P2/1PPP4/Kn1k1P2/1P1p1p2/1p1R3p/1N1R1N1B w - - 0 1)

Erokhin, Vladimir Alekseevich

Shakhmaty (Riga), 1976

8/3p4/1p1Q1P2/1PPP4/Kn1k1P2/1P1p1p2/1p1R3p/1N1R1N1B

#2

13 + 8

15148 Sadier Collection 2021

SOLUTION

  • SOUND
  • Sets
    • 1...Ke4
      • 2.Qe5#
    • 1...bxc5
      • 2.Qe5#
  • Tries
    • 1.Kxb4?
      • threat
        • 2.Qe5#
      • 1...Ke4
        • 2.Qe5#
      • 1...bxc5+!
    • 1.Rxd3+?
      • 1...Ke4
        • 2.Sg3#
        • 2.Qe5#
      • 1...Sxd3!
    • 1.Qe7?
      • 1...Kxd5
        • 2.Qe5#
      • 1...Sxd5
        • 2.Rxd3#
      • 1...bxc5
        • 2.Qe5#
      • 1...Sa2
        • 2.Rxd3#
      • 1...Sc2
        • 2.Rxd3#
      • 1...Sa6
        • 2.Rxd3#
      • 1...Sc6
        • 2.Rxd3#
      • 1...f2
        • 2.Qe3#
      • 1...d6!
  • Keys
    • 1.Sg3!
      • 1...Ke3
        • 2.Qe5#
      • 1...Sxd5
        • 2.Rxd3#
      • 1...bxc5
        • 2.Qe5#
      • 1...Sa2
        • 2.Rxd3#
      • 1...Sc2
        • 2.Rxd3#
      • 1...Sa6
        • 2.Rxd3#
      • 1...Sc6
        • 2.Rxd3#
      • 1...f2
        • 2.Sf5#

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 0
    • ADDED MATES = 7
    • REMOVED MATES = 1
  • Sets
    • K(f);N_SPINP(c),P-FLIGHT,P_SPINP(d)::QAR1(L)
    • P(g);SBLOCK,XP(J)::QAB1(L)
  • Tries
    • Try
      • K(G);P-FLIGHT,XS(e)
      • Threat
        • QAB1(L)
      • Vars
        • K(f);N_SPINP(c),P-FLIGHT,P_SPINP(d)::QAR1(L)
      • Refutation
        • P(g);CHECK,XP(J)
    • Try
      • R(E);CHECK,XP(c)
      • Refutation
        • S(e);P_SPINS(e),XR(E)
    • Try
      • Q(L);
      • Vars
        • K(f);P-FLIGHT,XP(K)::QAR1(L)
        • S(e);N_GUARD,SBLOCK,XP(K)::R1(E),XP(c)
        • P(g);SBLOCK,XP(J)::QAB1(L)
        • S(e);N_GUARD::R1(E),XP(c)
        • P(d);::QAB1(L)
      • Refutation
        • P(h);
  • Actual
    • S(C);
    • Vars
      • K(f);N_SPINP(c),S_FLIGHT::QAR2(L)
      • S(e);N_GUARD,P_SPINS(e),XP(K)::R1(E),XP(c)
      • P(g);SBLOCK,XP(J)::QAB1(L)
      • S(e);N_GUARD::R1(E),XP(c)
      • P(d);::S(C)
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