MESON Chess Problem Database

Problem Display
PID: 235635 (4B2B/4R3/pp1PN3/3k1P2/1RN3P1/1P2p1K1/1pn2P2/qQ6 w - - 0 1)

Erokhin, Vladimir Alekseevich

Mat, 1986

4B2B/4R3/pp1PN3/3k1P2/1RN3P1/1P2p1K1/1pn2P2/qQ6

#2

13 + 7

15148 Sadier Collection 2021

SOLUTION

  • SOUND
  • Sets
    • 1...Ke4
      • 2.Sf4#
    • 1...Qa2
      • 2.Qh1#
    • 1...Qa3
      • 2.Qh1#
    • 1...Qa4
      • 2.Qh1#
    • 1...Qa5
      • 2.Qh1#
    • 1...Sa3
      • 2.Qd3#
  • Tries
    • 1.Sxe3+?
      • 1...Sxe3
        • 2.Rd4#
        • 2.Qd3#
      • 1...Kxd6!
    • 1.Rb5+?
      • 1...Ke4
        • 2.Sf4#
        • 2.Qxc2#
      • 1...axb5!
    • 1.Rc7?
      • threat
        • 2.Bc6#
      • 1...Sxb4
        • 2.Sf4#
      • 1...Qa4
        • 2.Qh1#
      • 1...Sd4
        • 2.Sf4#
      • 1...Ke4!
    • 1.Qd1+?
      • 1...Ke4
        • 2.Sf4#
        • 2.Sc5#
        • 2.Sg5#
        • 2.Sc7#
        • 2.Sg7#
        • 2.Sd8#
        • 2.Sf8#
        • 2.Bc6#
        • 2.f3#
      • 1...Sd4
        • 2.Qxd4#
      • 1...Qxd1!
  • Keys
    • 1.Rxb6!
      • threat
        • 2.Bc6#
      • 1...Ke4
        • 2.Sf4#
      • 1...Qa4
        • 2.Qh1#
      • 1...Sb4
        • 2.Sxe3#
      • 1...Sd4
        • 2.Sxe3#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 2
    • REMOVED MATES = 4
  • Sets
    • K(e);P_SPINS(c),S_FLIGHT::R(K)+S(J)
    • Q(a);N_GUARD::QAB(A)
    • S(c);OGATE::QAR2(A)
  • Tries
    • Try
      • S(F);CHECK,XP(d)
      • Refutation
        • K(e);P-FLIGHT,XP(I)
    • Try
      • R(E);CHECK
      • Refutation
        • P(f);XR(E)
    • Try
      • R(K);
      • Threat
        • B(L)
      • Vars
        • S(c);XR(E)::S(J)
        • Q(a);N_GUARD::QAB(A)
        • S(c);::S(J)
      • Refutation
        • K(e);P_SPINS(c),S_FLIGHT
    • Try
      • Q(A);CHECK
      • Vars
        • S(c);N_GUARD,P_SPINS(c)::QAR1(A),XS(c)
      • Refutation
        • Q(a);XQ(A)
  • Actual
    • R(E);XP(g)
    • Threat
      • B(L)
    • Vars
      • K(e);P_SPINS(c),S_FLIGHT::R(K)+S(J)
      • Q(a);N_GUARD::QAB(A)
      • S(c);N_GUARD::S(F),XP(d)
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