MESON Chess Problem Database

Problem Display
PID: 231153 (8/8/2p1P3/P1k1N2R/p1B5/7r/bP1Q1b1P/5K2 w - - 0 1)

Lobel, Emil

Arbeiter Schachzeitung, 1927

8/8/2p1P3/P1k1N2R/p1B5/7r/bP1Q1b1P/5K2

#2

9 + 6

6490 yacpdb 2021

SOLUTION

  • SOUND
  • Sets
    • 1...a3
      • 2.b4#
  • Tries
    • 1.Sd3+?
      • 1...Kxc4
        • 2.Qc3#
      • 1...Kd4
        • 2.Qf4#
      • 1...Kd6!
    • 1.Sf3+?
      • 1...Kxc4
        • 2.Qc3#
      • 1...Rxh5!
    • 1.Sxc6+?
      • 1...Kxc4
        • 2.Qd5#
      • 1...Kxc6
        • 2.Qd7#
      • 1...Rxh5!
    • 1.Qd5+?
      • 1...Kb4
        • 2.Sxc6#
      • 1...cxd5!
  • Keys
    • 1.Qf4!
      • threat
        • 2.Sd3#
      • 1...Kb4
        • 2.Sxc6#
      • 1...Kd6
        • 2.Sg6#
      • 1...Rd3
        • 2.Sxd3#
      • 1...Bd4
        • 2.Qf8#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 4
    • REMOVED MATES = 1
  • Sets
    • P(d);N_GUARD::P(B)
  • Tries
    • Try
      • S(G);CHECK
      • Vars
        • K(e);P-FLIGHT,XB(E)::QAR1(C)
        • K(e);S_FLIGHT::QAR2(C)
      • Refutation
        • K(e);S_FLIGHT
    • Try
      • S(G);CHECK
      • Vars
        • K(e);P-FLIGHT,XB(E)::QAR1(C)
      • Refutation
        • R(c);XR(H)
    • Try
      • S(G);CHECK,XP(f)
      • Vars
        • K(e);P-FLIGHT,XB(E)::QAB1(C)
        • K(e);P-FLIGHT,XS(G)::QAB1(C)
      • Refutation
        • R(c);XR(H)
    • Try
      • Q(C);CHECK
      • Vars
        • K(e);S_FLIGHT::S(G),XP(f)
      • Refutation
        • P(f);XQ(C)
  • Actual
    • Q(C);
    • Threat
      • R(H)+S(G),DCHECK
    • Vars
      • K(e);S_FLIGHT::S(G),XP(f)
      • K(e);S_FLIGHT::QAB(C)+S(G)
      • R(c);::R(H)+S(G),DCHECK,XR(c)
      • B(b);SBLOCK::QAB(C)
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