MESON Chess Problem Database

Problem Display
PID: 77034 (2qN4/2pN1r2/2pk1nbQ/8/2PB3r/b4R1B/4R3/5K2 w - - 0 1)

Wirtanen, Erkki Aukusti

Aveseli, 1942

2qN4/2pN1r2/2pk1nbQ/8/2PB3r/b4R1B/4R3/5K2

#2

9 + 9

56 The Problemist 2007
5454 Near Snap 2009

SOLUTION

  • SOUND
  • Sets
    • 1...Qb7
      • 2.Sxb7#
    • 1...Qxd7
      • 2.Sb7#
    • 1...Rf4
      • 2.Qxf4#
    • 1...Rxd7
      • 2.Re6#
      • 2.Rxf6#
    • 1...Rg7
      • 2.Rxf6#
    • 1...Rh7
      • 2.Rxf6#
    • 1...Rf8
      • 2.Qxf8#
    • 1...Bc1
      • 2.Bc5#
    • 1...Bb2
      • 2.Bc5#
    • 1...Bc5
      • 2.Bxc5#
    • 1...Bb1
      • 2.Sxf7#
    • 1...Bc2
      • 2.Sxf7#
    • 1...Bd3
      • 2.Sxf7#
    • 1...Bh7
      • 2.Sxf7#
    • 1...Sd5
      • 2.Sxf7#
    • 1...Sh5
      • 2.Sxf7#
    • 1...Sxd7
      • 2.Sxf7#
      • 2.Re6#
    • 1...Sh7
      • 2.Sxf7#
    • 1...Se8
      • 2.Sxf7#
    • 1...Sg8
      • 2.Sxf7#
  • Tries
    • 1.Qf8+?
      • 1...Re7
        • 2.Be5#
        • 2.Rxf6#
        • 2.Qxe7#
      • 1...Rxf8!
  • Keys
    • 1.Rd3!
      • threat
        • 2.Bc5#
      • 1...Rf4+
        • 2.Qxf4#
      • 1...Se4+
        • 2.Bf6#
      • 1...Sg4+
        • 2.Bf2#
      • 1...Sd5+
        • 2.Sxf7#
      • 1...Sh5+
        • 2.Sxf7#
      • 1...Sxd7+
        • 2.Sxf7#
      • 1...Sh7+
        • 2.Sxf7#
      • 1...Se8+
        • 2.Sxf7#
      • 1...Sg8+
        • 2.Sxf7#
      • 1...Qxd7
        • 2.Sb7#
      • 1...Rxd4
        • 2.Qf4#
      • 1...Rxd7
        • 2.Re6#
      • 1...Bxd3
        • 2.Sxf7#
      • 1...Bc5
        • 2.Bxc5#
      • 1...c5
        • 2.Bxc5#

Anticipated by 96(1930)

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 6
    • REMOVED MATES = 9
  • Sets
    • Q(i);N_GUARD::S(I),XQ(i)
    • Q(i);N_GUARD,XS(H)::S(I)
    • R(b);N_GUARD,P_PINR(C)::QAB(G),XR(b)
    • R(h);N_GUARD::R(C),XS(e)
    • R(h);N_GUARD::QAB(G),XR(h)
    • B(a);N_GUARD::B(F)
    • B(a);N_GUARD::B(F),XB(a)
    • B(f);N_GUARD,P_SPINS(e)::S(I),XR(h)
    • B(f);N_GUARD,P_PINR(B),P_SPINS(e)::S(I),XR(h)
    • S(e);P_PINR(C),P_SPINB(f)::S(I),XR(h)
  • Tries
    • Try
      • Q(G);CHECK
      • Refutation
        • R(h);XQ(G)
  • Actual
    • R(C);
    • Threat
      • R(C)+B(F),DCHECK
    • Vars
      • R(b);CHECK,N_GUARD::QAB(G),XR(b)
      • S(e);CHECK,P_SPINB(f),S_CUTR(b)::R(C)+B(F)
      • S(e);CHECK,N_GUARD,P_SPINB(f),S_CUTR(b)::R(C)+B(F)
      • S(e);CHECK,P_SPINB(f)::S(I),XR(h)
      • S(e);CHECK,P_SPINB(f),XS(H)::S(I),XR(h)
      • Q(i);N_GUARD,XS(H)::S(I)
      • R(b);N_GUARD,P_SPINR(b),XB(F)::QAB(G)
      • R(h);SBLOCK,XS(H)::R1(B)
      • B(f);N_GUARD,P_PINR(B),P_SPINS(e),XR(C)::S(I),XR(h)
      • B(a);::R(C)+B(F),DCHECK,XB(a)
      • P(c);::R(C)+B(F),DCHECK,XP(c)
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