MESON Chess Problem Database

Problem Display
PID: 179465 (8/3b1n2/2N1R1p1/2Pk1p2/3PN2b/nP6/1p6/3R1Q1K w - - 0 1)

Davidenko, Fedor Vasilevich

Die Schwalbe, 1979

8/3b1n2/2N1R1p1/2Pk1p2/3PN2b/nP6/1p6/3R1Q1K

#2

9 + 8

6490 yacpdb 2018

SOLUTION

  • SOUND
  • Sets
    • 1...Kxe6
      • 2.d5#
    • 1...Sb1
      • 2.Qc4#
    • 1...Sc2
      • 2.Qc4#
    • 1...Sc4
      • 2.Qxc4#
    • 1...Sb5
      • 2.Qc4#
  • Tries
    • 1.Qe2?
      • threat
        • 2.Sc3#
      • 1...Kxe6
        • 2.d5#
      • 1...Bxe6
        • 2.Sb4#
      • 1...fxe4
        • 2.Qxe4#
      • 1...Sd6
        • 2.Rxd6#
      • 1...Be1
        • 2.Sf6#
      • 1...Sb1
        • 2.Qc4#
      • 1...Sb5
        • 2.Qc4#
      • 1...Se5
        • 2.Rd6#
      • 1...b1S!
    • 1.Qxf5+?
      • 1...Se5
        • 2.Sc3#
        • 2.Sb4#
        • 2.Rd6#
        • 2.Qxe5#
        • 2.dxe5#
      • 1...gxf5!
  • Keys
    • 1.Qa6!
      • threat
        • 2.Sb4#
      • 1...Kxe6
        • 2.d5#
      • 1...Bxc6
        • 2.Qxc6#
      • 1...Bxe6
        • 2.Sc3#
      • 1...Se5
        • 2.Rxe5#
      • 1...Be1
        • 2.Se7#
      • 1...Sc2
        • 2.Qc4#
      • 1...Sd6
        • 2.Re5#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 5
    • REMOVED MATES = 3
  • Sets
    • K(d);OGATE,S_FLIGHT,XR(I)::P(E)
    • S(b);N_GUARD::QAB1(B)
    • S(b);N_GUARD::QAB1(B),XS(b)
  • Tries
    • Try
      • Q(B);
      • Threat
        • S(F)
      • Vars
        • K(d);OGATE,S_FLIGHT,XR(I)::P(E)
        • B(g);SBLOCK,XR(I)::S(H)
        • P(e);OGATE,XS(F)::QAB1(B),XP(e)
        • S(h);N_GUARD::R1(I),XS(h)
        • B(c);N_GUARD::S(F)
        • S(b);N_GUARD::QAB1(B)
        • S(h);N_GUARD::R1(I)
      • Refutation
        • P(a);
    • Try
      • Q(B);CHECK,XP(e)
      • Refutation
        • P(f);XQ(B)
  • Actual
    • Q(B);
    • Threat
      • S(H)
    • Vars
      • K(d);OGATE,S_FLIGHT,XR(I)::P(E)
      • B(g);OGATE,XS(H)::QAB1(B),XB(g)
      • B(g);SBLOCK,XR(I)::S(F)
      • S(h);N_GUARD::R1(I),XS(h)
      • B(c);N_GUARD::S(H)
      • S(b);N_GUARD::QAB1(B)
      • S(h);N_GUARD::R1(I)
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