MESON Chess Problem Database

Problem Display
PID: 194228 (3bR3/2p5/2P1r3/K4N1Q/3Pk3/3R2P1/8/4nB2 w - - 0 1)

van der Ven, AMA

Handelsblad, 1917

3bR3/2p5/2P1r3/K4N1Q/3Pk3/3R2P1/8/4nB2

#2

9 + 5

6490 yacpdb 2019

SOLUTION

  • SOUND
  • Sets
    • 1...Re5+
      • 2.Rxe5#
    • 1...Sc2
      • 2.Qf3#
    • 1...Sg2
      • 2.Qf3#
    • 1...Sxd3
      • 2.Bg2#
    • 1...Sf3
      • 2.Qxf3#
  • Tries
    • 1.Se3?
      • threat
        • 2.Rxe6#
        • 2.Qg4#
        • 2.Qd5#
        • 2.Qf5#
      • 1...Re5+
        • 2.Rxe5#
      • 1...Rxe8
        • 2.Qg4#
        • 2.Qd5#
        • 2.Qf5#
      • 1...Re7
        • 2.Qg4#
        • 2.Qd5#
        • 2.Qf5#
      • 1...Bg5
        • 2.Rxe6#
      • 1...Bf6
        • 2.Qg4#
        • 2.Qd5#
        • 2.Qf5#
      • 1...Be7
        • 2.Qg4#
        • 2.Qd5#
        • 2.Qf5#
      • 1...Sg2
        • 2.Rxe6#
        • 2.Qd5#
        • 2.Qf5#
      • 1...Sf3
        • 2.Qg4#
        • 2.Qg6#
        • 2.Qd5#
        • 2.Qf5#
        • 2.Qh7#
      • 1...Sxd3!
    • 1.Bg2+?
      • 1...Sxg2
        • 2.Qf3#
      • 1...Sf3
        • 2.Qxf3#
      • 1...Kxd3!
    • 1.Qe2+?
      • 1...Kd5
        • 2.Qxe6#
      • 1...Kxf5!
  • Keys
    • 1.Qg6!
      • threat
        • 2.Qxe6#
      • 1...Re5+
        • 2.Rxe5#
      • 1...Kd5
        • 2.Qxe6#
      • 1...Rxe8
        • 2.Se7#
      • 1...Sxd3
        • 2.Bg2#
      • 1...Re7
        • 2.Sxe7#
      • 1...Bf6
        • 2.Se7#
      • 1...Sf3
        • 2.Se3#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 1
    • ADDED MATES = 4
    • REMOVED MATES = 2
  • Sets
    • R(c);CHECK,OGATE::R1(I),XR(c)
    • S(a);N_GUARD::QAB1(G)
    • S(a);N_GUARD,SBLOCK,XR(B)::B(A)
    • S(a);N_GUARD::QAB1(G),XS(a)
  • Tries
    • Try
      • S(F);
      • Threat
        • DUALS(4)
      • Vars
        • R(c);CHECK,OGATE::R1(I),XR(c)
        • B(e);::R(I),XR(c)
      • Refutation
        • S(a);XR(B)
    • Try
      • B(A);CHECK
      • Vars
        • S(a);N_GUARD,XB(A)::QAB1(G)
        • S(a);N_GUARD,P_SPINS(a)::QAB1(G),XS(a)
      • Refutation
        • K(b);N_SPINR(c),S_FLIGHT,XR(B)
    • Try
      • Q(G);CHECK
      • Vars
        • K(b);N_SPINR(c),OGATE,S_FLIGHT::QAB1(G),XR(c)
      • Refutation
        • K(b);N_SPINR(c),S_FLIGHT,XS(F)
  • Actual
    • Q(G);
    • Threat
      • QAR2(G),XR(c)
    • Vars
      • R(c);CHECK,OGATE::R1(I),XR(c)
      • K(b);N_SPINR(c),S_FLIGHT::QAB1(G),XR(c)
      • R(c);N_GUARD,N_SPINR(c),XR(I)::QAB(G)+S(F)
      • S(a);N_GUARD,SBLOCK,XR(B)::B(A)
      • R(c);N_GUARD::QAB(G)+S(F),XR(c)
      • B(e);::QAB(G)+S(F)
      • S(a);SBLOCK::QAB(G)+S(F)
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