MESON Chess Problem Database

Problem Display
PID: 43343 (8/4N3/r1nQ2nq/3p2rp/1p1k1pp1/p7/B1R2P2/4R2K w - - 0 1)

Ahues, Herbert Siegfried Oskar

Die Schwalbe, 1959

8/4N3/r1nQ2nq/3p2rp/1p1k1pp1/p7/B1R2P2/4R2K

#2

7 + 12

SOLUTION

  • SOUND
  • Sets
    • 1...Sce5
      • 2.Qxd5#
    • 1...Sge5
      • 2.Qxd5#
  • Tries
    • 1.Sxd5?
      • threat
        • 2.Rd2#
      • 1...Kd3
        • 2.Sxb4#
      • 1...Rxd5
        • 2.Qxd5#
      • 1...Sce5
        • 2.Sb6#
      • 1...Sge5
        • 2.Sf6#
      • 1...b3!
    • 1.Re3?
      • threat
        • 2.Rd2#
        • 2.Rc4#
        • 2.Qc5#
      • 1...Ra5
        • 2.Sxc6#
        • 2.Rd2#
        • 2.Rc4#
      • 1...Sa5
        • 2.Rd2#
        • 2.Qc5#
      • 1...Sce5
        • 2.Qc5#
        • 2.Qxd5#
      • 1...Sge5
        • 2.Qc5#
        • 2.Qxd5#
      • 1...b3
        • 2.Qc5#
      • 1...fxe3!
    • 1.Qxb4+?
      • 1...Kd3
        • 2.Rd2#
        • 2.Qd2#
        • 2.Qc3#
      • 1...Sxb4!
    • 1.Qxf4+?
      • 1...Kd3
        • 2.Qd2#
      • 1...Sxf4!
  • Keys
    • 1.Bxd5!
      • threat
        • 2.Rd1#
      • 1...Kd3
        • 2.Be4#
      • 1...Rxd5
        • 2.Qxd5#
      • 1...Sce5
        • 2.Bc6#
      • 1...Sge5
        • 2.Be6#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 2
    • ADDED MATES = 2
    • REMOVED MATES = 0
  • Sets
    • S(j);S_CUTR(g)::QAR1(F),XP(f)
    • S(k);S_CUTR(g)::QAR1(F),XP(f)
  • Tries
    • Try
      • S(G);XP(f)
      • Threat
        • R(D)
      • Vars
        • K(c);P-FLIGHT::QAR(F)+S(G),DCHECK,XP(b)
        • R(g);OGATE,P_SPINR(g),XS(G)::QAR1(F),XR(g)
        • S(j);S_CUTR(g)::QAR(F)+S(G)
        • S(k);S_CUTR(g)::QAR(F)+S(G)
      • Refutation
        • P(b);
    • Try
      • R(A);
      • Threat
        • DUALS(3)
      • Vars
        • P(b);::QAB1(F)
      • Refutation
        • P(d);XR(A)
    • Try
      • Q(F);CHECK,N_PINP(f),XP(b)
      • Refutation
        • S(j);XQ(F)
    • Try
      • Q(F);CHECK,N_PINP(f),XP(d)
      • Vars
        • K(c);P-FLIGHT::QAR1(F)
      • Refutation
        • S(k);XQ(F)
  • Actual
    • B(C);XP(f)
    • Threat
      • R(A)
    • Vars
      • K(c);P-FLIGHT::QAR(F)+B(C),DCHECK
      • R(g);OGATE,P_SPINR(g),XB(C)::QAR1(F),XR(g)
      • S(j);S_CUTR(g)::QAR(F)+B(C)
      • S(k);S_CUTR(g)::QAR(F)+B(C)
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