MESON Chess Problem Database

Problem Display
PID: 146923 (4R3/5p1q/6pp/K3p2r/2NR4/2p5/3pk2p/3N3Q w - - 0 1)

Arvidsson, K Erland

Il Problema, 1932

4R3/5p1q/6pp/K3p2r/2NR4/2p5/3pk2p/3N3Q

#2

6 + 10

14868 Pirnie Collection 2013

SOLUTION

  • SOUND
  • Sets
    • 1...c2
      • 2.Rxd2#
    • 1...f5
      • 2.Rxe5#
  • Tries
    • 1.Rf4?
      • threat
        • 2.Qf1#
      • 1...Kd3
        • 2.Qe4#
      • 1...e4+!
    • 1.Qf3+?
      • 1...Ke1
        • 2.Re4#
      • 1...Kxf3!
  • Keys
    • 1.Sxe5!
      • threat
        • 2.Re4#
      • 1...Rxe5+
        • 2.Rxe5#
      • 1...Rh3
        • 2.Sf3#
      • 1...Rh4
        • 2.Sg4#
      • 1...g5
        • 2.Sg6#
      • 1...f5
        • 2.Sf7#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 1
    • ADDED MATES = 4
    • REMOVED MATES = 1
  • Sets
    • P(d);N_GUARD::R1(D),XP(a)
    • P(i);S_CUTR(f)::R(F),XP(e)
  • Tries
    • Try
      • R(D);
      • Threat
        • QAB1(B)
      • Vars
        • K(b);N_SPINP(e),S_FLIGHT::QAB1(B)
      • Refutation
        • P(e);CHECK
    • Try
      • Q(B);CHECK
      • Vars
        • K(b);P-FLIGHT::R(D)
      • Refutation
        • K(b);N_SPINP(e),S_FLIGHT,XQ(B)
  • Actual
    • S(C);P_SPINS(C),XP(e)
    • Threat
      • R(D)
    • Vars
      • R(f);CHECK,OGATE,P_SPINR(f),XS(C)::R(F),XR(f)
      • R(f);N_PINS(C)::R(F)+S(C)
      • P(g);N_PINS(C)::R(F)+S(C)
      • P(i);N_PINS(C)::R(F)+S(C)
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