MESON Chess Problem Database

Problem Display
PID: 53137 (n5QK/3N4/4R3/1p1k1P2/3PN3/Ppbqpb2/8/1BR5 w - - 0 1)

Strerath, Otto

3rd HM., ADS, 1949-1950

n5QK/3N4/4R3/1p1k1P2/3PN3/Ppbqpb2/8/1BR5

#2

10 + 8

461 Schach-Express 1950

SOLUTION

  • SOUND
  • Sets
    • 1...Kc4
      • 2.Rd6#
    • 1...Qf1
      • 2.Rd6#
    • 1...Qe2
      • 2.Rd6#
    • 1...Qc4
      • 2.Rd6#
    • 1...Qd1
      • 2.Rd6#
    • 1...Qd2
      • 2.Rd6#
    • 1...Qxd4+
      • 2.Rf6#
    • 1...Bxd4+
      • 2.Re5#
  • Tries
    • 1.Sef6+?
      • 1...Kc4
        • 2.Re4#
      • 1...Kxd4!
    • 1.Sb6+?
      • 1...Kxd4
        • 2.Qg7#
        • 2.Qd8#
      • 1...Sxb6!
    • 1.Sdf6+?
      • 1...Kc4
        • 2.Rd6#
      • 1...Kxd4!
    • 1.Bxd3?
      • threat
        • 2.Rd6#
      • 1...Bxd4+
        • 2.Re5#
        • 2.Rf6#
      • 1...Kxd4
        • 2.Rd6#
      • 1...Bxe4!
    • 1.Re5+?
      • 1...Kxd4
        • 2.Qd5#
      • 1...Kc6!
  • Keys
    • 1.Qd8!
      • threat
        • 2.Sb6#
      • 1...Qxd4+
        • 2.Se5#
      • 1...Bxd4+
        • 2.Sdf6#
      • 1...Kc4
        • 2.Se5#
      • 1...Kxd4
        • 2.Sb6#
      • 1...Sb6
        • 2.Sxb6#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 3
    • ADDED MATES = 2
    • REMOVED MATES = 5
  • Sets
    • K(g);P_SPINB(b),S_FLIGHT::QAB(I)+R(G)
    • Q(c);::QAB(I)+R(G),DCHECK
    • Q(c);SBLOCK::QAB(I)+R(G),DCHECK
    • Q(c);CHECK,SBLOCK,XP(D)::QAB(I)+R(G)
    • B(b);CHECK,SBLOCK,XP(D)::QAB(I)+R(G),DCHECK
  • Tries
    • Try
      • S(E);CHECK,N_SPINP(D)
      • Vars
        • K(g);P_SPINB(b),S_FLIGHT::QAB(I)+R(G)
      • Refutation
        • K(g);P-FLIGHT,XP(D)
    • Try
      • S(H);CHECK
      • Refutation
        • S(h);XS(H)
    • Try
      • S(H);CHECK,N_SPINP(D)
      • Vars
        • K(g);P_SPINB(b),S_FLIGHT::QAB(I)+R(G)
      • Refutation
        • K(g);P-FLIGHT,XP(D)
    • Try
      • B(A);XQ(c)
      • Threat
        • QAB(I)+R(G),DCHECK
      • Vars
        • K(g);P-FLIGHT,XP(D)::R(G)
      • Refutation
        • B(e);XS(E)
    • Try
      • R(G);CHECK,N_SPINP(D)
      • Vars
        • K(g);P-FLIGHT,XP(D)::QAR1(I)
      • Refutation
        • K(g);P_SPINB(b),S_FLIGHT
  • Actual
    • Q(I);
    • Threat
      • QAR(I)+S(H),DCHECK
    • Vars
      • Q(c);CHECK,SBLOCK,XP(D)::QAR(I)+S(H)
      • B(b);CHECK,SBLOCK,XP(D)::QAR(I)+S(H),DCHECK
      • K(g);P_SPINB(b),S_FLIGHT::S(H)
      • K(g);P-FLIGHT,XP(D)::QAR(I)+S(H)
      • S(h);::QAR(I)+S(H),DCHECK,XS(h)
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