MESON Chess Problem Database

Problem Display
PID: 17720 (3N4/5pB1/p2p2P1/2pkr2Q/2pN1R2/K3Pn1p/2P3rR/6nB w - - 0 1)

ten Cate, Pieter

2nd Prize, American Chess Problemist, 1949

3N4/5pB1/p2p2P1/2pkr2Q/2pN1R2/K3Pn1p/2P3rR/6nB

#2

11 + 11

70 American Chess Problemist 1950
133 The Problemist Supplement 2017

SOLUTION

  • SOUND
  • Sets
    • 1...Rf5
      • 2.e4#
    • 1...Rg5
      • 2.e4#
    • 1...Rxh5
      • 2.e4#
    • 1...Sxd4
      • 2.e4#
  • Tries
    • 1.Sb5?
      • threat
        • 2.Sc3#
        • 2.Sc7#
        • 2.e4#
      • 1...Rxc2
        • 2.Sc7#
        • 2.e4#
      • 1...Re2
        • 2.Sc3#
        • 2.Sc7#
      • 1...Rgg5
        • 2.Sc3#
        • 2.Sc7#
        • 2.Rd2#
      • 1...Se2
        • 2.Sc7#
        • 2.e4#
      • 1...Sd2
        • 2.Sc3#
        • 2.Sc7#
      • 1...Sg5
        • 2.Sc3#
        • 2.Sc7#
        • 2.Qd1#
      • 1...c3
        • 2.Sxc3#
        • 2.Sc7#
      • 1...f5
        • 2.Sc3#
        • 2.Sc7#
      • 1...axb5!
    • 1.S4c6?
      • threat
        • 2.Se7#
        • 2.e4#
      • 1...Re2
        • 2.Se7#
      • 1...Rgg5
        • 2.Rd2#
      • 1...Sd2
        • 2.Se7#
      • 1...Sg5
        • 2.Qd1#
      • 1...c3
        • 2.Se7#
      • 1...f5!
    • 1.S4e6?
      • threat
        • 2.Sc7#
        • 2.e4#
      • 1...Re2
        • 2.Sc7#
      • 1...Rgg5
        • 2.Sc7#
        • 2.Rd2#
      • 1...Sd2
        • 2.Sc7#
      • 1...Sg5
        • 2.Sc7#
        • 2.Qd1#
      • 1...c3
        • 2.Sc7#
      • 1...f5
        • 2.Sc7#
      • 1...fxe6!
    • 1.Qxf3+?
      • 1...Re4
        • 2.Rf5#
        • 2.Qxe4#
      • 1...Sxf3!
  • Keys
    • 1.Sf5!
      • threat
        • 2.Se7#
      • 1...Rxe3+
        • 2.Sxe3#
      • 1...Rxf5
        • 2.e4#
      • 1...Rg5
        • 2.Rd2#
      • 1...Re7
        • 2.Sxe7#
      • 1...Sg5
        • 2.Qd1#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 4
    • REMOVED MATES = 3
  • Sets
    • R(h);::P(E)
    • R(h);N_SPINR(h),XQ(H)::P(E)
    • S(c);N_SPINR(h),P_SPINR(b),SBLOCK,XS(F)::P(E)
  • Tries
    • Try
      • S(F);
      • Threat
        • DUALS(3)
      • Refutation
        • P(i);XS(F)
    • Try
      • S(F);
      • Threat
        • DUALS(2)
      • Vars
        • R(b);P_SPINS(c)::S(F)
        • R(b);N_SPINR(h),OGATE,P_SPINS(c)::R(C)
        • S(c);N_SPINR(h),P_SPINR(b)::S(F)
        • S(c);N_SPINR(h),OGATE,P_SPINR(b)::QAR(H)
        • P(e);::S(F)
      • Refutation
        • P(k);N_SPINR(h)
    • Try
      • S(F);
      • Threat
        • DUALS(2)
      • Vars
        • R(b);P_SPINS(c)::S(F)
        • S(c);N_SPINR(h),P_SPINR(b)::S(F)
        • P(e);::S(F)
        • P(k);N_SPINR(h)::S(F)
      • Refutation
        • P(k);XS(F)
    • Try
      • Q(H);CHECK,N_PINR(h),XS(c)
      • Refutation
        • S(a);XQ(H)
  • Actual
    • S(F);N_PINR(h)
    • Threat
      • S(F)
    • Vars
      • R(h);CHECK,XP(E)::QAR(H)+S(F),DCHECK,XR(h)
      • R(h);N_GUARD,P_SPINR(h),XS(F)::P(E)
      • R(b);OGATE,P_SPINS(c)::R(C)
      • R(h);::QAR(H)+S(F),DCHECK,XR(h)
      • S(c);OGATE,P_SPINR(b)::QAR(H)
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