MESON Chess Problem Database

Problem Display
PID: 79422 (8/2N2qPQ/4R1p1/1R1BNk1p/K2p1p1B/3P1p2/1p2r1P1/8 w - - 0 1)

Forster, Klaus

2nd Prize, Die Schwalbe, 2007

8/2N2qPQ/4R1p1/1R1BNk1p/K2p1p1B/3P1p2/1p2r1P1/8

#2

11 + 9

23 Die Schwalbe 2013

SOLUTION

  • SOUND
  • Sets
    • 1...Qxe6
      • 2.Bxe6#
    • 1...Qg8
      • 2.Qxg6#
    • 1...Qxc7
      • 2.Qxg6#
    • 1...Qd7
      • 2.Qxg6#
    • 1...Qe7
      • 2.Qxg6#
    • 1...Qf8
      • 2.Qxg6#
      • 2.gxf8Q#
      • 2.gxf8R#
    • 1...Rc2
      • 2.Be4#
    • 1...Rd2
      • 2.Be4#
    • 1...Rf2
      • 2.Be4#
    • 1...Rxg2
      • 2.Be4#
    • 1...Re4
      • 2.Bxe4#
      • 2.dxe4#
  • Tries
    • 1.Sxg6?
      • threat
        • 2.Qxh5#
      • 1...Kg4
        • 2.Bxf3#
      • 1...Qxg6
        • 2.Qxg6#
      • 1...Rxg2
        • 2.Bxf3#
      • 1...Qe7
        • 2.Se5#
      • 1...Qf6!
    • 1.Sxf7?
      • threat
        • 2.Sh6#
        • 2.Qxg6#
      • 1...Rxg2
        • 2.Sh6#
        • 2.Bxf3#
      • 1...Rxe6
        • 2.Bxe6#
      • 1...Kg4!
    • 1.Rf6+?
      • 1...Kxe5
        • 2.Bxf7#
      • 1...Qxf6!
    • 1.Qxh5+?
      • 1...g5
        • 2.Qg4#
        • 2.Qxf7#
        • 2.Qxg5#
      • 1...gxh5!
    • 1.Qh6?
      • threat
        • 2.Qg5#
      • 1...Rxg2
        • 2.Be4#
      • 1...Qe7
        • 2.Qxg6#
      • 1...g5
        • 2.Qxg5#
      • 1...Qf6!
  • Keys
    • 1.Rxg6!
      • threat
        • 2.Qxh5#
      • 1...Kxe5
        • 2.Bxf7#
      • 1...Qxg6
        • 2.Be6#
      • 1...Rxg2
        • 2.Be4#
      • 1...Qf6
        • 2.Rg5#
      • 1...Qe7
        • 2.Re6#

This is a version of 77143

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 1
    • ADDED MATES = 3
    • REMOVED MATES = 7
  • Sets
    • Q(i);OGATE,XR(H)::B(F),XQ(i)
    • Q(i);N_GUARD::QAB1(K),XP(h)
    • Q(i);N_GUARD,XS(I)::QAB1(K),XP(h)
    • Q(i);N_GUARD,P_PINR(E)::QAB1(K),XP(h)
    • R(b);N_GUARD::B(F)
    • R(b);N_GUARD,XP(A)::B(F)
  • Tries
    • Try
      • S(G);XP(h)
      • Threat
        • QAR2(K),XP(g)
      • Vars
        • K(f);S_FLIGHT::B(F),XP(c)
        • Q(i);OGATE,P_SPINQ(i),XS(G)::QAB1(K),XQ(i)
        • R(b);N_GUARD,XP(A)::R(E)+B(F),XP(c)
        • Q(i);N_GUARD::QAB(K)+S(G)
      • Refutation
        • Q(i);
    • Try
      • S(G);XQ(i)
      • Threat
        • DUALS(2)
      • Vars
        • R(b);OGATE,XR(H)::R(E)+B(F),DCHECK,XR(b)
      • Refutation
        • K(f);N_SPINP(h),S_FLIGHT
    • Try
      • R(H);CHECK
      • Vars
        • K(f);N_SPINP(h),P-FLIGHT,XS(G)::R(E)+B(F),XQ(i)
      • Refutation
        • Q(i);XR(H)
    • Try
      • Q(K);CHECK,N_PINP(h),XP(g)
      • Refutation
        • P(h);XQ(K)
    • Try
      • Q(K);N_PINP(h)
      • Threat
        • QAR1(K)
      • Vars
        • R(b);N_GUARD,XP(A)::B(F)
        • Q(i);N_GUARD::QAB1(K),XP(h)
        • P(h);::QAR1(K),XP(h)
      • Refutation
        • Q(i);
  • Actual
    • R(H);XP(h)
    • Threat
      • QAR2(K),XP(g)
    • Vars
      • K(f);OGATEB,P-FLIGHT,XS(G)::R(E)+B(F),XQ(i)
      • Q(i);N_GUARD,P_SPINQ(i),XR(H)::B(F)
      • R(b);N_GUARD,XP(A)::B(F)
      • Q(i);SBLOCK::QAB(K)+R(H),DCHECK
      • Q(i);N_GUARD::QAB(K)+R(H)
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