MESON Chess Problem Database

Problem Display
PID: 87735 (8/K5Q1/pP2Rn2/B1bN3n/p2k1p2/r4R2/B7/8 w - - 0 1)

Postma, Bernardus

Problemisten, 1947

8/K5Q1/pP2Rn2/B1bN3n/p2k1p2/r4R2/B7/8

#2

8 + 8

6490 yacpdb 2009

SOLUTION

  • SOUND
  • Sets
    • 1...Rc3
      • 2.Bxc3#
    • 1...Bxb6+
      • 2.Bxb6#
    • 1...Sg3
      • 2.Qxf6#
  • Tries
    • 1.Rxf4+?
      • 1...Kd3
        • 2.Bb1#
      • 1...Sxf4!
  • Keys
    • 1.Sc3!
      • threat
        • 2.Se2#
        • 2.Re4#
        • 2.Qg1#
      • 1...Bxb6+
        • 2.Bxb6#
      • 1...Rxa2
        • 2.Re4#
      • 1...Rxc3
        • 2.Bxc3#
      • 1...Sxg7
        • 2.Se2#
      • 1...Rb3
        • 2.Re4#
      • 1...Bb4
        • 2.Qg1#
      • 1...Bd6
        • 2.Qg1#
      • 1...Be7
        • 2.Qg1#
      • 1...Bf8
        • 2.Qg1#
      • 1...Sg3
        • 2.Qxf6#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 7
    • REMOVED MATES = 0
  • Sets
    • R(a);N_GUARD::B(C),XR(a)
    • B(e);CHECK,OGATE,XP(E)::B(C),XB(e)
    • S(f);N_GUARD::QAB(H),XS(h)
  • Tries
    • Try
      • R(B);CHECK,XP(d)
      • Vars
        • K(c);N_SPINS(h),P-FLIGHT::B(A)
      • Refutation
        • S(f);XR(B)
  • Actual
    • S(D);
    • Threat
      • DUALS(3)
    • Vars
      • B(e);CHECK,OGATE,XP(E)::B(C),XB(e)
      • R(a);XB(A)::R1(F)
      • R(a);OGATE,XS(D)::B(C),XR(a)
      • S(f);N_SPINS(h),XQ(H)::S(D)
      • R(a);::R1(F)
      • B(e);N_PINP(E)::QAB(H)
      • S(f);N_GUARD::QAB(H),XS(h)
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