MESON Chess Problem Database

Problem Display
PID: 179710 (4K3/1p1B4/Q2pR1nB/3pPkN1/1q6/1b5P/2P2P1P/3N4 w - - 0 1)

Kopnin, Aleksey Grigorevich

Source?, 1988

4K3/1p1B4/Q2pR1nB/3pPkN1/1q6/1b5P/2P2P1P/3N4

#2

12 + 7

6490 yacpdb 2018

SOLUTION

  • SOUND
  • Sets
    • 1...Qf4
      • 2.Re7#
    • 1...Sf4
      • 2.Se3#
    • 1...dxe5
      • 2.Rf6#
  • Tries
    • 1.Qd3+?
      • 1...Kf4
        • 2.Sf3#
        • 2.Sf7#
        • 2.Sh7#
        • 2.Qf3#
      • 1...Qe4!
    • 1.Qxd6?
      • threat
        • 2.Rf6#
      • 1...Kf4
        • 2.Rf6#
      • 1...Qxd6!
    • 1.f4?
      • threat
        • 2.Rf6#
      • 1...Kxf4
        • 2.Qf1#
      • 1...Qxf4
        • 2.Re7#
      • 1...Sxf4
        • 2.Se3#
      • 1...Sxe5!
  • Keys
    • 1.Se4!
      • threat
        • 2.Sg3#
      • 1...Kxe4
        • 2.Qd3#
      • 1...Qxe4
        • 2.Re7#
      • 1...dxe4
        • 2.Se3#
      • 1...Qc3
        • 2.Sxd6#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 4
    • REMOVED MATES = 3
  • Sets
    • Q(b);SBLOCK::B(K)+R(I)
    • S(f);SBLOCK::S(A)
    • P(e);SBLOCK,XP(F)::B(K)+R(I),DCHECK
  • Tries
    • Try
      • Q(H);CHECK
      • Refutation
        • Q(b);P_SPINQ(b)
    • Try
      • Q(H);XP(e)
      • Threat
        • B(K)+R(I),DCHECK
      • Vars
        • K(d);P-FLIGHT::R(I)
      • Refutation
        • Q(b);XQ(H)
    • Try
      • P(C);
      • Threat
        • B(K)+R(I),DCHECK
      • Vars
        • K(d);OGATEB,P-FLIGHT,XP(C)::QAR(H)
        • Q(b);SBLOCK,XP(C)::B(K)+R(I)
        • S(f);SBLOCK,XP(C)::S(A)
      • Refutation
        • S(f);XP(F)
  • Actual
    • S(G);
    • Threat
      • S(G)
    • Vars
      • K(d);OGATEB,S_FLIGHT,XS(G)::QAB1(H)
      • Q(b);SBLOCK,XS(G)::B(K)+R(I)
      • P(c);SBLOCK,XS(G)::S(A)
      • Q(b);N_GUARD::S(G),XP(e)
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