MESON Chess Problem Database

Problem Display
PID: 262850 (1b1r2b1/5p2/2R2B2/1Q6/R2pkp2/5p2/2N2P2/2K5 w - - 0 1)

Zalokotsky, Roman Fedorovich (aka Fedorovich, Roman)

Szachy, 1978

1b1r2b1/5p2/2R2B2/1Q6/R2pkp2/5p2/2N2P2/2K5

#2

7 + 8

6490 yacpdb 2022

SOLUTION

  • SOUND
  • Sets
    • 1...Rc8
      • 2.Rxd4#
    • 1...Re8
      • 2.Rxd4#
    • 1...Rf8
      • 2.Rxd4#
    • 1...Bd6
      • 2.Rxd4#
  • Tries
    • 1.Se3?
      • threat
        • 2.Qb1#
        • 2.Qf5#
      • 1...Rd5
        • 2.Qb1#
      • 1...Be5
        • 2.Qb1#
      • 1...Bh7
        • 2.Qb1#
      • 1...fxe3!
    • 1.Re6+?
      • 1...Be5
        • 2.Rxe5#
      • 1...fxe6!
    • 1.Qd3+?
      • 1...Kd5
        • 2.Sb4#
        • 2.Qxf3#
      • 1...Kxd3!
    • 1.Qe5+?
      • 1...Kd3
        • 2.Se1#
        • 2.Sb4#
        • 2.Ra3#
      • 1...Bxe5!
  • Keys
    • 1.Qb1!
      • threat
        • 2.Se3#
      • 1...Kd3
        • 2.Sxd4#
      • 1...Kd5
        • 2.Sb4#
      • 1...Kf5
        • 2.Se3#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 4
  • Sets
    • R(g);N_GUARD::R1(D),XP(b)
    • B(f);S_CUTR(g)::R1(D),XP(b)
  • Tries
    • Try
      • S(B);
      • Threat
        • DUALS(2)
      • Vars
        • R(g);::QAB(E)
        • B(f);::QAB(E)
        • B(h);::QAB(E)
      • Refutation
        • P(d);XS(B)
    • Try
      • R(F);CHECK
      • Vars
        • B(f);N_GUARD,P_SPINB(f)::R1(F),XB(f)
      • Refutation
        • P(e);XR(F)
    • Try
      • Q(E);CHECK
      • Refutation
        • K(c);N_SPINP(b),S_FLIGHT,XQ(E)
    • Try
      • Q(E);CHECK
      • Refutation
        • B(f);XQ(E)
  • Actual
    • Q(E);
    • Threat
      • QAB(E)+S(B)
    • Vars
      • K(c);N_GUARD,N_SPINP(b),S_FLIGHT::QAB(E)+S(B),XP(b)
      • K(c);N_SPINP(b),S_CUTP(b),S_FLIGHT::S(B)
      • K(c);N_SPINP(b),S_FLIGHT::QAB(E)+S(B),DCHECK
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