MESON Chess Problem Database

Problem Display
PID: 16891 (4R3/8/4N3/B7/B1p5/bNR1Ppp1/4knp1/1K2n1Q1 w - - 0 1)

Valve, Leo Erland

3rd Prize, Hys JT, 1944

4R3/8/4N3/B7/B1p5/bNR1Ppp1/4knp1/1K2n1Q1

#2

9 + 8

SOLUTION

  • SOUND
  • Sets
    • 1...Sc2
      • 2.Sf4#
    • 1...Sed3
      • 2.Sed4#
    • 1...Sd1
      • 2.Sed4#
      • 2.Sf4#
  • Tries
    • 1.Sc1+?
      • 1...Kd2
        • 2.Rd3#
      • 1...Bxc1!
    • 1.Rc2+?
      • 1...Kd1
        • 2.Rd2#
        • 2.Qxe1#
      • 1...Kd3
        • 2.Sf4#
      • 1...Sxc2
        • 2.Sf4#
      • 1...Kxe3!
  • Keys
    • 1.Rd3!
      • threat
        • 2.Sf4#
      • 1...Kxd3
        • 2.Sf4#
      • 1...Sexd3
        • 2.Sed4#
      • 1...Sfxd3
        • 2.Sbd4#
      • 1...cxd3
        • 2.Qxe1#
      • 1...Bd6
        • 2.Sc1#
      • 1...Sh3
        • 2.Rd2#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 5
    • REMOVED MATES = 1
  • Sets
    • S(a);::S(H)
  • Tries
    • Try
      • S(C);CHECK
      • Vars
        • K(b);P-FLIGHT::B(G)+R(D),DCHECK
      • Refutation
        • B(e);XS(C)
    • Try
      • R(D);CHECK
      • Vars
        • K(b);S_FLIGHT::S(H)
        • S(a);XR(D)::S(H)
      • Refutation
        • K(b);P-FLIGHT,P_SPINS(c),XP(E)
  • Actual
    • R(D);
    • Threat
      • S(H)
    • Vars
      • K(b);S_FLIGHT,XR(D)::S(H)
      • S(a);SBLOCK,XR(D)::S(H)
      • S(c);SBLOCK,XR(D)::S(C)
      • P(h);SBLOCK,XR(D)::QAR1(B),XS(a)
      • B(e);N_GUARD::S(C)
      • S(c);::R1(D)
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