MESON Chess Problem Database

Problem Display
PID: 219127 (b7/4Q1NK/1q4p1/3kN3/1B2pR1n/3pp3/4B3/3R2r1 w - - 0 1)

Usunov, Emil

Deutsche Schachzeitung, 1959

b7/4Q1NK/1q4p1/3kN3/1B2pR1n/3pp3/4B3/3R2r1

#2

8 + 9

15148 Sadier Collection 2020

SOLUTION

  • SOUND
  • Sets
    • 1...Kd4
      • 2.Rxd3#
    • 1...Qd4
      • 2.Qd6#
      • 2.Qe6#
    • 1...Qa5
      • 2.Qd6#
    • 1...Qc5
      • 2.Qxc5#
    • 1...Qa7
      • 2.Qd6#
    • 1...Qd8
      • 2.Qc5#
    • 1...Qb5
      • 2.Qd6#
    • 1...Qa6
      • 2.Qc5#
    • 1...Qd6
      • 2.Qxd6#
    • 1...Qe6
      • 2.Qc5#
    • 1...Qf6
      • 2.Qc5#
    • 1...Qb7
      • 2.Qc5#
      • 2.Qd6#
    • 1...Qb8
      • 2.Qc5#
    • 1...Bc6
      • 2.Qd6#
  • Tries
    • 1.Rxd3+?
      • 1...Qd4
        • 2.Qc5#
        • 2.Qd6#
        • 2.Qe6#
      • 1...exd3!
    • 1.Qe6+?
      • 1...Kd4
        • 2.Rxd3#
      • 1...Qxe6!
    • 1.Qd7+?
      • 1...Qd6
        • 2.Qxd6#
      • 1...Kxe5!
  • Keys
    • 1.Sxd3!
      • threat
        • 2.Qxe4#
      • 1...Kc4
        • 2.Sc1#
      • 1...Kd4
        • 2.Se1#
      • 1...Kc6
        • 2.Se5#
      • 1...Qxb4
        • 2.Sxb4#
      • 1...exd3
        • 2.Qe4#
      • 1...Qd4
        • 2.Qe6#
      • 1...Qc5
        • 2.Qxc5#
      • 1...Qe6
        • 2.Qc5#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 1
    • ADDED MATES = 5
    • REMOVED MATES = 9
  • Sets
    • K(f);P-FLIGHT::R1(A),XP(b)
    • Q(g);N_GUARD::QAR1(F)
    • Q(g);N_GUARD::QAR1(F),XQ(g)
    • B(i);S_CUTQ(g)::QAR1(F)
  • Tries
    • Try
      • R(A);CHECK,XP(b)
      • Refutation
        • P(d);XR(A)
    • Try
      • Q(F);CHECK
      • Vars
        • K(f);P-FLIGHT::R1(A),XP(b)
      • Refutation
        • Q(g);XQ(F)
    • Try
      • Q(F);CHECK
      • Vars
        • Q(g);N_GUARD,P_SPINQ(g)::QAR1(F),XQ(g)
      • Refutation
        • K(f);N_SPINP(b),P-FLIGHT,XS(E)
  • Actual
    • S(E);XP(b)
    • Threat
      • QAB1(F),XP(d)
    • Vars
      • K(f);P_SPINP(d),S_FLIGHT::B(B)+S(E)
      • K(f);P-FLIGHT,P_SPINP(d)::R(A)+S(E)
      • K(f);S_FLIGHT::S(E)
      • Q(g);XB(C)::R(A)+S(E),DCHECK,XQ(g)
      • P(d);P_SPINP(d),XS(E)::QAB1(F)
      • Q(g);N_GUARD,SBLOCK::QAB1(F)
      • Q(g);N_GUARD::QAR1(F),XQ(g)
      • Q(g);N_GUARD::QAR1(F)
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