MESON Chess Problem Database

Problem Display
PID: 125203 (4k3/1Np2pP1/1NpB1Pq1/1Pp2Ppb/3PKP2/r2P1B2/4R3/4b3 w - - 0 1)

Sankaran, Nandakumar

Internet, 1998

(First published on Tue Apr 28 1998)

4k3/1Np2pP1/1NpB1Pq1/1Pp2Ppb/3PKP2/r2P1B2/4R3/4b3

#2

13 + 10

6490 yacpdb 2009
5454 Near Snap 2014

SOLUTION

  • SOUND
  • Sets
    • 1...Qxf5+
      • 2.Kxf5#
    • 1...Qxf6
      • 2.g8Q#
      • 2.g8R#
    • 1...Rxd3
      • 2.Kxd3#
    • 1...Bxf3+
      • 2.Kxf3#
    • 1...cxd4
      • 2.Kxd4#
    • 1...gxf4
      • 2.Kxf4#
    • 1...cxb5
      • 2.Kd5#
  • Tries
    • 1.Ke5?
      • threat
        • 2.Bxc6#
      • 1...Qxf5+
        • 2.Kxf5#
      • 1...Qxf6+
        • 2.Kxf6#
      • 1...cxd6+
        • 2.Kxd6#
      • 1...cxb5
        • 2.Kd5#
        • 2.Bc6#
      • 1...Bxf3!
  • Keys
    • 1.Ke3!
      • threat
        • 2.Bxc6#
      • 1...Rxd3+
        • 2.Kxd3#
      • 1...Bd2+
        • 2.Kxd2#
      • 1...Bf2+
        • 2.Kxf2#
      • 1...cxd4+
        • 2.Kxd4#
      • 1...gxf4+
        • 2.Kxf4#
      • 1...Qxf5
        • 2.g8Q#
        • 2.g8R#
      • 1...Bxf3
        • 2.Kxf3#
      • 1...cxb5
        • 2.Bc6#

Anticipated by 172027(1969)

This anticipates 34904(1998-1999)

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 1
    • ADDED MATES = 2
    • REMOVED MATES = 1
  • Sets
    • Q(g);CHECK,XP(H)::R(A)+K(E),XQ(g)
    • Q(g);N_GUARD,N_PINP(H),XP(K)::P=Q
    • R(b);XP(B)::R(A)+K(E),XR(b)
    • B(e);CHECK,XB(C)::R(A)+K(E),XB(e)
    • P(c);XP(D)::R(A)+K(E),XP(c)
    • P(d);XP(F)::R(A)+K(E),XP(d)
    • P(f);XP(G)::R(A)+K(E)
  • Tries
    • Try
      • K(E);N_SPINP(H),P-FLIGHT
      • Threat
        • B(C),XP(f)
      • Vars
        • Q(g);CHECK,XP(H)::R(A)+K(E),XQ(g)
        • Q(g);CHECK,XP(K)::R(A)+K(E),XQ(g)
        • P(h);CHECK,XB(J)::R(A)+K(E),XP(h)
      • Refutation
        • B(e);XB(C)
  • Actual
    • K(E);N_SPINP(H),P-FLIGHT,P_SPINP(B)
    • Threat
      • B(C),XP(f)
    • Vars
      • R(b);CHECK,XP(B)::R(A)+K(E),XR(b)
      • B(a);CHECK::R(A)+K(E),XB(a)
      • P(c);CHECK,XP(D)::R(A)+K(E),XP(c)
      • P(d);CHECK,XP(F)::R(A)+K(E),XP(d)
      • Q(g);N_GUARD,XP(H)::P=Q
      • B(e);XB(C)::R(A)+K(E),XB(e)
      • P(f);XP(G)::B(C)
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