MESON Chess Problem Database

Problem Display
PID: 270798 (5QB1/2R1r1n1/r1P5/ppkNBNq1/pRP2p2/2p3n1/P7/4K3 w - - 0 1)

Livshits, Eduard Yakovlevich

Rudenko, Valentin Fedorovich

The Observer, 1959

(First published on Sun Sep 20 1959)

5QB1/2R1r1n1/r1P5/ppkNBNq1/pRP2p2/2p3n1/P7/4K3

#2

11 + 11

17397 Ling Notebooks 2023

SOLUTION

  • SOUND
  • Sets
    • 1...Qg4
      • 2.Qxe7#
    • 1...Qxf5
      • 2.Qxe7#
    • 1...Qh5
      • 2.Qxe7#
    • 1...Se2
      • 2.Bd6#
    • 1...Se4
      • 2.Bd4#
    • 1...Se6
      • 2.Bd6#
  • Tries
    • 1.Sf6?
      • threat
        • 2.Rxb5#
      • 1...Kxb4
        • 2.Qxe7#
      • 1...Kb6
        • 2.Rxb5#
      • 1...axb4
        • 2.Sd7#
      • 1...bxc4
        • 2.Qxe7#
      • 1...Rb6
        • 2.Qxe7#
      • 1...Se6!
    • 1.Sdxe7?
      • threat
        • 2.Rxb5#
      • 1...Kxb4
        • 2.Bd6#
      • 1...Kb6
        • 2.Sd5#
        • 2.Sc8#
        • 2.Rxb5#
      • 1...axb4
        • 2.Bd4#
      • 1...bxc4
        • 2.Bd6#
      • 1...Rb6
        • 2.Bd6#
      • 1...Se6!
    • 1.Qb8?
      • threat
        • 2.Qxb5#
      • 1...bxc4
        • 2.Rb5#
        • 2.Qb5#
      • 1...Rb6
        • 2.Qxb6#
      • 1...Rxe5+!
  • Keys
    • 1.Sde3!
      • threat
        • 2.Rxb5#
      • 1...Kxb4
        • 2.Bd6#
      • 1...Kb6
        • 2.Rxb5#
      • 1...axb4
        • 2.Bd4#
      • 1...bxc4
        • 2.Bd6#
      • 1...Rb6
        • 2.Bd6#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 5
    • REMOVED MATES = 6
  • Sets
    • Q(h);N_GUARD::QAB(J),XR(j)
    • Q(h);N_GUARD,XS(G)::QAB(J),XR(j)
    • S(b);N_PINB(F)::B(F)
    • S(k);N_PINB(F)::B(F)
  • Tries
    • Try
      • S(E);
      • Threat
        • R1(C),XP(f)
      • Vars
        • K(g);N_GUARD,S_FLIGHT,XR(C)::QAB(J),XR(j)
        • K(g);N_SPINR(j),P_SPINP(f),S_FLIGHT::R1(C),XP(f)
        • P(e);SBLOCK,XR(C)::S(E)
        • P(f);XP(D)::QAB(J),XR(j)
        • R(i);SBLOCK::QAB(J),XR(j)
      • Refutation
        • S(k);N_PINB(F)
    • Try
      • S(E);N_SPINB(F),XR(j)
      • Threat
        • R1(C),XP(f)
      • Vars
        • K(g);N_GUARD,S_FLIGHT,XR(C)::B(F)
        • P(e);SBLOCK,XR(C)::B(F)
        • P(f);XP(D)::B(F)
        • R(i);SBLOCK::B(F)
      • Refutation
        • S(k);
    • Try
      • Q(J);N_PINR(j)
      • Threat
        • QAR1(J),XP(f)
      • Vars
        • R(i);N_GUARD::QAB1(J),XR(i)
      • Refutation
        • R(j);CHECK,XB(F)
  • Actual
    • S(E);N_SPINB(F)
    • Threat
      • R1(C),XP(f)
    • Vars
      • K(g);N_GUARD,S_FLIGHT,XR(C)::B(F)
      • K(g);N_SPINR(j),P_SPINP(f),S_FLIGHT::R1(C),XP(f)
      • P(e);SBLOCK,XR(C)::B(F)
      • P(f);XP(D)::B(F)
      • R(i);SBLOCK::B(F)
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