MESON Chess Problem Database

Problem Display
PID: 271098 (1nrbR3/2p1n3/N1p3N1/2Pk4/R1p1p1Q1/8/1P1P1P2/7K w - - 0 1)

Davidenko, Fedor Vasilevich

Schakend Nederland, 1981

1nrbR3/2p1n3/N1p3N1/2Pk4/R1p1p1Q1/8/1P1P1P2/7K

#2

10 + 9

15601 Albrecht-Leiss-Degener Collection 2023

SOLUTION

  • SOUND
  • Sets
    • 1...Sf5
      • 2.Qxe4#
    • 1...Sxg6
      • 2.Qxe4#
    • 1...Sg8
      • 2.Qxe4#
    • 1...Sd7
      • 2.Qxd7#
    • 1...c3
      • 2.Qxe4#
    • 1...e3
      • 2.Qxc4#
  • Tries
    • 1.Sf4+?
      • 1...Kd4
        • 2.Qg7#
      • 1...Ke5!
    • 1.Rxc4?
      • threat
        • 2.Qxe4#
      • 1...e3
        • 2.Sb4#
        • 2.Rd4#
        • 2.Qe4#
      • 1...Kxc4!
    • 1.Rxd8+?
      • 1...Sd7
        • 2.Rxd7#
        • 2.Qxd7#
      • 1...Rxd8!
    • 1.Qe2?
      • threat
        • 2.Qxc4#
      • 1...Kd4
        • 2.Qxc4#
      • 1...c3
        • 2.Qc4#
        • 2.Qxe4#
      • 1...Ke6!
    • 1.Qe6+?
      • 1...Kd4
        • 2.Qxc4#
      • 1...Kxe6!
    • 1.d3?
      • threat
        • 2.Qxe4#
      • 1...Kd4
        • 2.Qxe4#
      • 1...exd3
        • 2.Qxc4#
      • 1...e3
        • 2.Qxc4#
        • 2.Qe4#
        • 2.dxc4#
      • 1...Sxa6!
    • 1.f3?
      • threat
        • 2.Qxe4#
      • 1...Kd4
        • 2.Qxe4#
      • 1...exf3
        • 2.Qxc4#
      • 1...e3
        • 2.Qxc4#
        • 2.Qe4#
      • 1...Sxa6!
  • Keys
    • 1.d4!
      • 1...Kxd4
        • 2.Qd1#
      • 1...Sxg6
        • 2.Qxe4#
      • 1...Sxa6
        • 2.Qd7#
      • 1...cxd4 ep
        • 2.Qxe4#
      • 1...exd4 ep
        • 2.Qxc4#
      • 1...Sf5
        • 2.Qxe4#
      • 1...Sg8
        • 2.Qxe4#
      • 1...Sd7
        • 2.Qxd7#
      • 1...c3
        • 2.Sf4#
      • 1...e3
        • 2.Sb4#

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 2
    • ADDED MATES = 4
    • REMOVED MATES = 0
  • Sets
    • S(f);::QAB1(F),XP(b)
    • S(f);XS(I)::QAB1(F),XP(b)
    • S(g);N_GUARD::QAR2(F),XS(g)
    • P(a);::QAB1(F),XP(b)
    • P(b);OGATE::QAB1(F),XP(a)
  • Tries
    • Try
      • S(I);CHECK
      • Vars
        • K(c);P-FLIGHT,P_SPINP(a)::QAB(F)
      • Refutation
        • K(c);P-FLIGHT,P_SPINS(f)
    • Try
      • R(E);XP(a)
      • Threat
        • QAB1(F),XP(b)
      • Refutation
        • K(c);P_SPINP(b),S_FLIGHT,XR(E)
    • Try
      • R(J);CHECK,XB(i)
      • Refutation
        • R(h);XR(J)
    • Try
      • Q(F);
      • Threat
        • QAB1(F),XP(a)
      • Vars
        • K(c);P-FLIGHT,P_SPINP(a)::QAR1(F),XP(a)
      • Refutation
        • K(c);P_SPINP(b),P_SPINS(f),S_FLIGHT
    • Try
      • Q(F);CHECK
      • Vars
        • K(c);OGATE,P-FLIGHT,P_SPINP(a)::QAR1(F),XP(a)
      • Refutation
        • K(c);P_SPINS(f),S_FLIGHT,XQ(F)
    • Try
      • P(C);
      • Threat
        • QAB1(F),XP(b)
      • Vars
        • K(c);P-FLIGHT,P_SPINP(a)::QAR1(F),XP(b)
        • P(b);OGATE,XP(C)::QAB1(F),XP(a)
      • Refutation
        • S(g);XS(H)
    • Try
      • P(D);
      • Threat
        • QAB1(F),XP(b)
      • Vars
        • K(c);P-FLIGHT,P_SPINP(a)::QAR1(F),XP(b)
        • P(b);OGATE,XP(D)::QAB1(F),XP(a)
      • Refutation
        • S(g);XS(H)
  • Actual
    • P(C);
    • Vars
      • K(c);OGATEB,P-FLIGHT,P_SPINP(a),XP(C)::QAR(F)
      • S(f);XS(I)::QAB1(F),XP(b)
      • S(g);N_GUARD,XS(H)::QAR2(F)
      • P(a);EP,XP(C)::QAB1(F),XP(b)
      • P(b);EP,OGATE,XP(C)::QAB1(F),XP(a)
      • S(f);::QAB1(F),XP(b)
      • S(g);N_GUARD::QAR2(F),XS(g)
      • P(a);::S(I)
      • P(b);::S(H)
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