MESON Chess Problem Database

Problem Display
PID: 167767 (6K1/B1np4/3P2R1/6b1/1NRPk3/4P2Q/3nrp1N/6r1 w - - 0 1)

Isaev, Leonid Antonovich

Bristol Times and Mirror, 1925

(First published on Wed Jan 21 1925)

6K1/B1np4/3P2R1/6b1/1NRPk3/4P2Q/3nrp1N/6r1

#2

10 + 8

14868 Pirnie Collection 2018

SOLUTION

  • SOUND
  • Sets
    • 1...Sb1
      • 2.Qf3#
    • 1...Sf1
      • 2.Qf3#
    • 1...Sb3
      • 2.Qf3#
    • 1...Sf3
      • 2.Qxf3#
    • 1...Sxc4
      • 2.Qf3#
  • Tries
    • 1.Qg4+?
      • 1...Kxe3
        • 2.Rc3#
        • 2.d5#
      • 1...Bf4
        • 2.Qxf4#
      • 1...Rxg4!
    • 1.Qf5+?
      • 1...Kxe3
        • 2.Sc2#
        • 2.Rc3#
        • 2.d5#
      • 1...Kxf5!
  • Keys
    • 1.Qh7!
      • threat
        • 2.Re6#
      • 1...Kxe3
        • 2.d5#
      • 1...Kf5
        • 2.Rh6#
      • 1...Rxe3
        • 2.Rf6#
      • 1...Bxe3
        • 2.Rg4#
      • 1...Bf4
        • 2.Rg3#
      • 1...Bh4
        • 2.Rg3#
      • 1...Bf6
        • 2.Rg3#
      • 1...Bh6
        • 2.Rg3#
      • 1...Be7
        • 2.Rg3#
      • 1...Bd8
        • 2.Rg3#
      • 1...Se6
        • 2.Rxe6#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 11
    • REMOVED MATES = 5
  • Sets
    • S(b);N_GUARD::QAB1(C)
    • S(b);N_GUARD::QAB1(C),XS(b)
    • S(b);N_GUARD,XR(E)::QAB1(C)
  • Tries
    • Try
      • Q(C);CHECK
      • Vars
        • B(f);N_GUARD,P_SPINB(f)::QAR1(C),XB(f)
      • Refutation
        • R(a);XQ(C)
    • Try
      • Q(C);CHECK
      • Refutation
        • K(e);S_FLIGHT,XQ(C)
  • Actual
    • Q(C);
    • Threat
      • QAB(C)+R(H),DCHECK
    • Vars
      • K(e);P-FLIGHT,XP(B)::B(I)+P(F)
      • K(e);S_FLIGHT::QAB(C)+R(H)
      • R(c);SBLOCK,XP(B)::QAB(C)+R(H)
      • B(f);OGATE,P_PINR(H),SBLOCK,XP(B)::QAB(C)+R(H),DCHECK
      • B(f);OGATE,P_PINR(H)::QAB(C)+R(H)
      • S(g);::QAB(C)+R(H),DCHECK,XS(g)
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