MESON Chess Problem Database

Problem Display
PID: 251763 (6r1/3p4/8/2Q5/p1p1Np1B/2p2pq1/1nK2Rp1/bR1nk3 w - - 0 1)

Forster, Klaus

Die Schwalbe, 2021

6r1/3p4/8/2Q5/p1p1Np1B/2p2pq1/1nK2Rp1/bR1nk3

#2

6 + 13

SOLUTION

  • SOUND
  • Sets
    • 1...Qxf2+
      • 2.Qxf2#
    • 1...Sd3
      • 2.Rxd1#
  • Tries
    • 1.Bf6?
      • threat
        • 2.Bxc3#
      • 1...Qxf2+
        • 2.Qxf2#
      • 1...Sd3
        • 2.Rxd1#
      • 1...Qg7!
    • 1.Qd4?
      • threat
        • 2.Qxc3#
      • 1...Qxf2+
        • 2.Qxf2#
      • 1...Sd3
        • 2.Rxd1#
      • 1...Qg7!
    • 1.Qxc4?
      • threat
        • 2.Qxc3#
      • 1...Qxf2+
        • 2.Bxf2#
      • 1...Sxc4
        • 2.Rxd1#
      • 1...Qg7
        • 2.Rf1#
      • 1...Sd3
        • 2.Rxd1#
      • 1...Rc8!
  • Keys
    • 1.Qe5!
      • threat
        • 2.Qxc3#
      • 1...Qxf2+
        • 2.Sd2#
      • 1...Qg7
        • 2.Sf6#
      • 1...Sd3
        • 2.Rxd1#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 1
    • ADDED MATES = 1
    • REMOVED MATES = 0
  • Sets
    • Q(h);CHECK,OGATE,P_SPINQ(h),XR(C)::QAB1(F),XQ(h)
    • S(d);N_GUARD::R1(A),XS(b)
  • Tries
    • Try
      • B(E);
      • Threat
        • B(E),XP(f)
      • Vars
        • Q(h);CHECK,OGATE,XR(C)::QAB1(F),XQ(h)
        • S(d);N_GUARD::R1(A),XS(b)
      • Refutation
        • Q(h);
    • Try
      • Q(F);
      • Threat
        • QAB(F),XP(f)
      • Vars
        • Q(h);CHECK,OGATE,P_SPINQ(h),XR(C)::QAB1(F),XQ(h)
        • S(d);N_GUARD::R1(A),XS(b)
      • Refutation
        • Q(h);
    • Try
      • Q(F);XP(j)
      • Threat
        • QAB(F),XP(f)
      • Vars
        • Q(h);CHECK,OGATE,P_SPINQ(h),XR(C)::B(E),XQ(h)
        • S(d);N_GUARD,XQ(F)::R1(A),XS(b)
        • Q(h);::B(E)+R(C),DCHECK
        • S(d);N_GUARD::R1(A),XS(b)
      • Refutation
        • R(m);
  • Actual
    • Q(F);
    • Threat
      • QAB(F),XP(f)
    • Vars
      • Q(h);CHECK,P_SPINQ(h),XR(C)::QAR(F)+S(D)
      • Q(h);::QAR(F)+S(D)
      • S(d);N_GUARD::R1(A),XS(b)
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