MESON Chess Problem Database

Problem Display
PID: 86862 (7b/B1p5/2R5/1pN5/PN3Q2/2k2b1R/KnB1p3/3nq3 w - - 0 1)

Davidenko, Fedor Vasilevich

Krasnojarska Sut., 1979

7b/B1p5/2R5/1pN5/PN3Q2/2k2b1R/KnB1p3/3nq3

#2

9 + 9

6490 yacpdb 2009

SOLUTION

  • SOUND
  • Sets
    • 1...Sxa4
      • 2.Sxa4#
    • 1...bxa4
      • 2.Sxa4#
  • Tries
    • 1.Rxf3+?
      • 1...Sd3
        • 2.Sb3#
        • 2.Scxd3#
        • 2.Sca6#
        • 2.Se6#
        • 2.Sb7#
        • 2.Sd7#
        • 2.Rxd3#
      • 1...Se3!
    • 1.Qd2+?
      • 1...Kxd2
        • 2.Sb3#
      • 1...Kc4
        • 2.Se4#
        • 2.Bb3#
      • 1...Qxd2!
    • 1.Qd4+?
      • 1...Kxd4
        • 2.Sd7#
      • 1...Bxd4!
  • Keys
    • 1.Qf8!
      • threat
        • 2.Se4#
      • 1...Kd2
        • 2.Sb3#
      • 1...Kxb4
        • 2.Sb7#
      • 1...Kc4
        • 2.Se4#
      • 1...Kd4
        • 2.Sd7#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 4
    • REMOVED MATES = 2
  • Sets
    • S(c);XP(D)::R(H)+S(G),DCHECK,XS(c)
    • P(g);XP(D)::R(H)+S(G),DCHECK,XP(g)
  • Tries
    • Try
      • R(C);CHECK,XB(f)
      • Refutation
        • S(a);P_SPINS(a)
    • Try
      • Q(F);CHECK
      • Vars
        • K(e);N_SPINB(f),S_FLIGHT,XQ(F)::S(G)
      • Refutation
        • Q(b);XQ(F)
    • Try
      • Q(F);CHECK
      • Vars
        • K(e);N_SPINB(f),S_FLIGHT,XQ(F)::B(I)+S(G)
      • Refutation
        • B(i);XQ(F)
  • Actual
    • Q(F);
    • Threat
      • R(H)+S(G),DCHECK
    • Vars
      • K(e);N_SPINB(f),S_FLIGHT::S(G)
      • K(e);N_SPINB(f),S_FLIGHT,XS(E)::QAB(F)+S(G)
      • K(e);N_SPINB(f),P-FLIGHT::R(H)+S(G)
      • K(e);N_SPINB(f),S_FLIGHT::B(I)+S(G)
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