MESON Chess Problem Database

Problem Display
PID: 90513 (3R4/2rbpp2/7R/2nkB3/2pP2Q1/b1r1P1NK/2B5/1q2n3 w - - 0 1)

Swane, Jan Arnold Willem

Die Schwalbe, 1949

3R4/2rbpp2/7R/2nkB3/2pP2Q1/b1r1P1NK/2B5/1q2n3

#2

9 + 11

6490 yacpdb 2009

SOLUTION

  • SOUND
  • Sets
    • 1...Sb3
      • 2.e4#
    • 1...Sd3
      • 2.e4#
    • 1...Sa4
      • 2.e4#
    • 1...Sa6
      • 2.e4#
    • 1...Se6
      • 2.Qe4#
    • 1...Sb7
      • 2.e4#
  • Tries
    • 1.Rxd7+?
      • 1...Sxd7
        • 2.Qe4#
        • 2.e4#
      • 1...Rxd7!
    • 1.Qxd7+?
      • 1...Sxd7
        • 2.e4#
      • 1...Rxd7!
  • Keys
    • 1.Sf5!
      • threat
        • 2.Sxe7#
      • 1...Rxe3+
        • 2.Sxe3#
      • 1...Se6
        • 2.Qe4#
      • 1...e6
        • 2.Se7#
      • 1...Sb3
        • 2.Qe4#
      • 1...Scd3
        • 2.e4#
      • 1...Sa4
        • 2.Qe4#
      • 1...Se4
        • 2.Qxe4#
      • 1...Sa6
        • 2.Qe4#
      • 1...Sb7
        • 2.Qe4#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 4
    • ADDED MATES = 3
    • REMOVED MATES = 0
  • Sets
    • S(f);N_GUARD::P(B)
    • S(f);N_PINQ(F)::QAB1(F)
  • Tries
    • Try
      • R(I);CHECK,N_SPINQ(F),XB(i)
      • Refutation
        • R(h);XR(I)
    • Try
      • Q(F);CHECK,N_SPINQ(F),XB(i)
      • Vars
        • S(f);P_SPINS(f),XQ(F)::P(B)
      • Refutation
        • R(h);P_SPINR(h),XQ(F)
  • Actual
    • S(C);N_SPINQ(F),P_SPINP(B)
    • Threat
      • S(C),XP(j)
    • Vars
      • R(d);CHECK,XP(B)::S(C),XR(d)
      • S(f);N_GUARD::QAB1(F)
      • P(j);::S(C)
      • S(f);N_PINP(B)::P(B)
      • S(f);N_GUARD::QAB1(F),XS(f)
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