MESON Chess Problem Database

Problem Display
PID: 226880 (1B1n1RQ1/1pr2b1r/7p/bPNR3p/1nKP1k1p/2N4P/3PP1P1/5q2 w - - 0 1)

Katzenellenbogen, Israel Davidovich

Die Schwalbe, 1928

1B1n1RQ1/1pr2b1r/7p/bPNR3p/1nKP1k1p/2N4P/3PP1P1/5q2

#2

13 + 12

SOLUTION

  • SOUND
  • Sets
    • 1...Qxe2+
      • 2.Sxe2#
    • 1...Qa1
      • 2.e3#
    • 1...Qb1
      • 2.e3#
    • 1...Qc1
      • 2.e3#
    • 1...Qd1
      • 2.e3#
    • 1...Qh1
      • 2.e3#
    • 1...Sd3
      • 2.e3#
    • 1...Sbc6
      • 2.Sd3#
    • 1...Sdc6
      • 2.Se6#
    • 1...b6
      • 2.Bxc7#
  • Tries
    • 1.Qg7?
      • threat
        • 2.Qe5#
      • 1...Qxe2+
        • 2.Sxe2#
      • 1...Sd3
        • 2.e3#
      • 1...Sbc6
        • 2.Sd3#
      • 1...Sdc6
        • 2.Se6#
        • 2.Rxf7#
      • 1...Rxg7!
  • Keys
    • 1.Qg6!
      • threat
        • 2.Qd6#
      • 1...Qxe2+
        • 2.Sxe2#
      • 1...Sxd5
        • 2.Sxd5#
      • 1...Sd3
        • 2.e3#
      • 1...Sbc6
        • 2.Sd3#
      • 1...Sdc6
        • 2.Se6#
      • 1...Se6
        • 2.Rf5#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 2
    • REMOVED MATES = 6
  • Sets
    • Q(a);CHECK,XP(B)::S(D),XQ(a)
    • Q(a);N_PINP(B)::P(B)
    • Q(a);N_PINP(B),N_PINS(I),P_PINS(D)::P(B)
    • S(b);N_PINP(B)::P(B)
    • S(b);N_PINS(I)::S(I)
    • S(l);N_PINS(I)::S(I)
    • P(h);S_CUTB(e)::B(K),XR(i)
  • Tries
    • Try
      • Q(M);
      • Threat
        • QAB1(M)
      • Vars
        • Q(a);CHECK,XP(B)::S(D),XQ(a)
        • S(b);N_PINP(B)::P(B)
        • S(b);N_PINS(I)::S(I)
      • Refutation
        • R(k);XQ(M)
  • Actual
    • Q(M);
    • Threat
      • QAB(M)
    • Vars
      • Q(a);CHECK,XP(B)::S(D),XQ(a)
      • S(b);XR(J)::S(D),XS(b)
      • S(b);N_PINP(B)::P(B)
      • S(b);N_PINS(I)::S(I)
      • S(l);N_PINS(I)::S(I)
      • S(l);N_PINR(J)::R1(J)
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