MESON Chess Problem Database

Problem Display
PID: 179463 (1bN2K2/1p1BN1n1/pQ4R1/3pkP1n/2p5/B3pPPb/3q4/8 w - - 0 1)

Davidenko, Fedor Vasilevich

3rd Prize, UV CSTV, 1977

1bN2K2/1p1BN1n1/pQ4R1/3pkP1n/2p5/B3pPPb/3q4/8

#2

10 + 11

6490 yacpdb 2018

SOLUTION

  • SOUND
  • Sets
    • 1...Qb4
      • 2.Qxe3#
    • 1...Qa5
      • 2.Qxe3#
    • 1...Qd1
      • 2.Qxe3#
    • 1...Qa2
      • 2.Qxe3#
    • 1...Qb2
      • 2.Qxe3#
    • 1...Qg2
      • 2.Qxe3#
    • 1...Qh2
      • 2.Qxe3#
    • 1...Bd6
      • 2.Bxd6#
    • 1...Ba7
      • 2.Bd6#
    • 1...Sf4
      • 2.Qf6#
    • 1...Sf6
      • 2.Qxf6#
    • 1...Sxf5
      • 2.Re6#
    • 1...Se6+
      • 2.Rxe6#
    • 1...Se8
      • 2.Re6#
    • 1...d4
      • 2.Qc5#
  • Tries
    • 1.Sd6?
      • threat
        • 2.Sf7#
      • 1...Se6+
        • 2.Rxe6#
      • 1...Bxd6
        • 2.Bxd6#
      • 1...Sxg3!
    • 1.Bb2+?
      • 1...Qc3
        • 2.Qxe3#
      • 1...Qxb2
        • 2.Qxe3#
      • 1...Qd4
        • 2.Bxd4#
        • 2.Qxd4#
      • 1...d4
        • 2.Qc5#
      • 1...c3!
    • 1.Rh6?
      • threat
        • 2.Sg6#
      • 1...Se6+
        • 2.Rxe6#
      • 1...Qb4
        • 2.Qxe3#
      • 1...Bd6
        • 2.Bxd6#
      • 1...Sf4
        • 2.Qf6#
      • 1...d4
        • 2.Qc5#
      • 1...Bxf5!
  • Keys
    • 1.Rg4!
      • threat
        • 2.Sg6#
      • 1...Se6+
        • 2.Qxe6#
      • 1...Bd6
        • 2.Qxd6#
      • 1...Qb4
        • 2.Qd4#
      • 1...Sf4
        • 2.gxf4#
      • 1...d4
        • 2.Re4#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 5
    • ADDED MATES = 0
    • REMOVED MATES = 10
  • Sets
    • Q(a);N_GUARD,P_PINS(H)::QAR2(E),XP(b)
    • Q(a);N_GUARD::QAR2(E),XP(b)
    • B(k);N_GUARD,P_PINS(H)::B(A),XB(k)
    • B(k);N_GUARD::B(A)
    • S(g);N_GUARD::QAB1(E)
    • S(g);N_GUARD::QAB1(E),XS(g)
    • S(j);N_GUARD,XP(D)::R1(F)
    • S(j);CHECK,N_GUARD::R1(F),XS(j)
    • S(j);N_GUARD::R1(F)
    • P(e);OGATEB::QAR2(E)
  • Tries
    • Try
      • S(I);
      • Threat
        • S(I)
      • Vars
        • S(j);CHECK,N_GUARD::R1(F),XS(j)
        • B(k);OGATE,P_PINS(H),XS(I)::B(A),XB(k)
      • Refutation
        • S(g);XP(C)
    • Try
      • B(A);CHECK
      • Vars
        • Q(a);P_SPINQ(a)::QAR2(E),XP(b)
        • Q(a);XB(A)::QAR2(E),XP(b)
        • P(e);P_SPINP(e),S_CUTP(d),S_CUTQ(a),S_CUTQ(a),S_CUTQ(a)::QAR2(E)
      • Refutation
        • P(d);P_SPINP(d)
    • Try
      • R(F);
      • Threat
        • S(H)
      • Vars
        • S(j);CHECK,N_GUARD::R1(F),XS(j)
        • Q(a);N_GUARD,P_PINS(H)::QAR2(E),XP(b)
        • B(k);N_GUARD,P_PINS(H)::B(A),XB(k)
        • S(g);N_GUARD::QAB1(E)
        • P(e);OGATEB::QAR2(E)
      • Refutation
        • B(c);XP(D)
  • Actual
    • R(F);
    • Threat
      • S(H)
    • Vars
      • S(j);CHECK,N_GUARD::QAR1(E),XS(j)
      • B(k);N_GUARD,P_PINS(H)::QAB1(E),XB(k)
      • Q(a);N_GUARD,P_PINS(H)::QAB1(E)
      • S(g);OGATE::P(C),XS(g)
      • P(e);N_GUARD::R1(F)
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