MESON Chess Problem Database

Problem Display
PID: 150555 (8/2pB4/3P4/1Npkp3/1p1r4/1P6/3QRN2/3K4 w - - 0 1)

La Rosa, Massimo

Due Alfieri, 1978

8/2pB4/3P4/1Npkp3/1p1r4/1P6/3QRN2/3K4

#2

8 + 6

6490 yacpdb 2014

SOLUTION

  • SOUND
  • Sets
    • 1...Rxd2+
      • 2.Rxd2#
    • 1...Rd3
      • 2.Qxd3#
    • 1...cxd6
      • 2.Sc7#
  • Tries
    • 1.Se4?
      • threat
        • 2.Sf6#
        • 2.Sxc7#
      • 1...cxd6
        • 2.Sf6#
        • 2.Sc7#
      • 1...c6
        • 2.Sf6#
        • 2.Sc7#
      • 1...Rd3
        • 2.Sf6#
        • 2.Qxd3#
      • 1...c4
        • 2.Sxc7#
      • 1...Rxd2+!
  • Keys
    • 1.Sd3!
      • threat
        • 2.Rxe5#
      • 1...Rxd3
        • 2.Qxd3#
      • 1...cxd6
        • 2.Sc7#
      • 1...Re4
        • 2.Sxb4#
        • 2.Sf4#
      • 1...e4
        • 2.Qg5#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 1
    • REMOVED MATES = 1
  • Sets
    • R(b);CHECK,N_SPINR(b),OGATE,XQ(B)::R(C),XR(b)
    • R(b);::QAR2(B),XR(b)
    • P(f);SBLOCK,XP(G)::S(F)
  • Tries
    • Try
      • S(D);
      • Threat
        • DUALS(2)
      • Vars
        • P(c);::S(F),XP(f)
      • Refutation
        • R(b);CHECK,N_SPINR(b),XQ(B)
  • Actual
    • S(D);N_PINR(b),N_SPINQ(B)
    • Threat
      • R1(C),XP(e)
    • Vars
      • R(b);OGATE,P_PINQ(B),P_SPINR(b),XS(D)::QAR2(B),XR(b)
      • P(f);SBLOCK,XP(G)::S(F)
      • P(e);OGATEB::QAR(B)
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