MESON Chess Problem Database

Problem Display
PID: 250774 (5Q1B/b2RP3/6pP/1p2PNP1/1Rq1k2K/4p1P1/1N6/3B3b w - - 0 1)

Erokhin, Vladimir Alekseevich

3rd HM., Thessalonika-2300 JT, 1986-1988

5Q1B/b2RP3/6pP/1p2PNP1/1Rq1k2K/4p1P1/1N6/3B3b

#2

13 + 7

14867 BCPS Library 2021

SOLUTION

  • SOUND
  • Sets
    • 1...Bf3
      • 2.Bc2#
    • 1...gxf5
      • 2.Qa8#
  • Tries
    • 1.Kg4?
      • threat
        • 2.Bc2#
        • 2.Qa8#
      • 1...Bf3+
        • 2.Bxf3#
      • 1...gxf5+
        • 2.Qxf5#
      • 1...Bb8
        • 2.Bc2#
      • 1...Bd4!
    • 1.Sxc4?
      • threat
        • 2.Sd2#
        • 2.Sb6#
      • 1...Bd4
        • 2.Rxd4#
      • 1...e2
        • 2.Sd2#
      • 1...Bc5
        • 2.Sd2#
      • 1...Bb6
        • 2.Sd2#
        • 2.Sxb6#
      • 1...bxc4!
    • 1.Sxe3?
      • threat
        • 2.Qf4#
      • 1...Bxe3
        • 2.Bc2#
      • 1...Kxe3+!
    • 1.Rxc4+?
      • 1...Bd4
        • 2.Rcxd4#
        • 2.Rdxd4#
      • 1...bxc4!
    • 1.g4?
      • threat
        • 2.Sg3#
      • 1...Kf4
        • 2.Sg3#
        • 2.Sd6#
      • 1...gxf5
        • 2.Qxf5#
      • 1...e2!
  • Keys
    • 1.Sd4!
      • threat
        • 2.Qf4#
      • 1...Qf1
        • 2.Qa8#
      • 1...Qf7
        • 2.Bc2#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 2
    • REMOVED MATES = 2
  • Sets
    • B(a);SBLOCK::B(A)
    • P(f);SBLOCK,XS(G)::QAB(L)
  • Tries
    • Try
      • K(E);P-FLIGHT
      • Threat
        • DUALS(2)
      • Vars
        • B(a);CHECK,N_GUARD::B(A),XB(a)
        • P(f);CHECK,OGATE,XS(G)::QAB1(L),XP(f)
        • B(g);::B(A)
      • Refutation
        • B(g);N_SPINQ(c)
    • Try
      • S(B);XQ(c)
      • Threat
        • DUALS(2)
      • Vars
        • B(g);N_GUARD::R1(J),XB(g)
        • P(b);::R(D)+S(B),DCHECK
        • B(g);::R(D)+S(B),DCHECK
      • Refutation
        • P(e);P_SPINP(e),XS(B)
    • Try
      • S(G);XP(b)
      • Threat
        • QAR1(L)
      • Vars
        • B(g);SBLOCK,XS(G)::B(A)
      • Refutation
        • K(d);CHECK,N_SPINQ(c),P-FLIGHT,XS(G)
    • Try
      • R(D);CHECK,XQ(c)
      • Refutation
        • P(e);XR(D)
    • Try
      • P(C);
      • Threat
        • S(G)
      • Vars
        • P(f);OGATE,XS(G)::QAB1(L),XP(f)
      • Refutation
        • P(b);
  • Actual
    • S(G);N_PINQ(c)
    • Threat
      • QAR1(L)
    • Vars
      • Q(c);N_GUARD::QAB(L)
      • Q(c);N_GUARD::B(A)
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