MESON Chess Problem Database

Problem Display
PID: 176072 (4n1K1/1N6/1pp2Pp1/3k2nb/4NR2/p1Q5/1r6/B3R3 w - - 0 1)

Schafft, Willy

Schach-Echo, 1940

4n1K1/1N6/1pp2Pp1/3k2nb/4NR2/p1Q5/1r6/B3R3

#2

8 + 9

6490 yacpdb 2018

SOLUTION

  • SOUND
  • Sets
    • 1...Ra2
      • 2.Qb3#
    • 1...Rd2
      • 2.Qb3#
    • 1...Re2
      • 2.Qb3#
    • 1...Rf2
      • 2.Qb3#
    • 1...Rg2
      • 2.Qb3#
    • 1...Rh2
      • 2.Qb3#
    • 1...Rb3
      • 2.Qxb3#
    • 1...Sxf6+
      • 2.Sxf6#
  • Tries
    • 1.Rd1+?
      • 1...Ke6
        • 2.Sxg5#
        • 2.Sd8#
      • 1...Rd2
        • 2.Qb3#
      • 1...Bxd1!
    • 1.Qd4+?
      • 1...Ke6
        • 2.Sec5#
        • 2.Sxg5#
        • 2.Sd8#
      • 1...Kxd4!
    • 1.Qd3+?
      • 1...Ke6
        • 2.Sec5#
        • 2.Sxg5#
      • 1...Ke5!
    • 1.Qc5+?
      • 1...bxc5
        • 2.Sc3#
      • 1...Ke6!
  • Keys
    • 1.Qf3!
      • threat
        • 2.Sc3#
      • 1...Sxf6+
        • 2.Sxf6#
      • 1...Kc4
        • 2.Sed6#
      • 1...Kd4
        • 2.Sxg5#
      • 1...Ke5
        • 2.Sxg5#
      • 1...Ke6
        • 2.Sec5#
      • 1...Sxe4
        • 2.Qxe4#
      • 1...Re2
        • 2.Qb3#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 5
    • REMOVED MATES = 6
  • Sets
    • R(a);N_GUARD::QAB(C)
    • R(a);N_GUARD::QAB(C),XR(a)
    • S(i);CHECK,XP(F)::S(D),XS(i)
  • Tries
    • Try
      • R(B);CHECK
      • Vars
        • R(a);P_SPINR(a)::QAB(C)
      • Refutation
        • B(e);XR(B)
    • Try
      • Q(C);CHECK
      • Refutation
        • K(c);P-FLIGHT,P_SPINR(a),XQ(C)
    • Try
      • Q(C);CHECK
      • Refutation
        • K(c);P-FLIGHT,P_SPINR(a)
    • Try
      • Q(C);CHECK
      • Vars
        • P(f);XQ(C)::S(D)
      • Refutation
        • K(c);S_FLIGHT
  • Actual
    • Q(C);
    • Threat
      • QAB(C)+S(D),DCHECK
    • Vars
      • S(i);CHECK,XP(F)::QAB(C)+S(D),DCHECK,XS(i)
      • K(c);S_FLIGHT::R(E)+S(D),DCHECK
      • K(c);P-FLIGHT,P_SPINR(a)::R(E)+S(D),XS(d)
      • K(c);P-FLIGHT,P_SPINR(a)::R(B)+S(D),XS(d)
      • K(c);S_FLIGHT::R(B)+S(D),DCHECK
      • S(d);OGATE,P_SPINS(d),XS(D)::QAB1(C),XS(d)
      • R(a);N_GUARD::QAB(C)
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